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Template:Infobox number 4000 (four thousand) is the natural number following 3999 and preceding 4001. It is a decagonal number.

Selected numbers in the range 4001–4999

• 4005 – triangular number
• 4007 – safe prime
• 4010 – magic constant of n×n normal magic square and n-queens problem for n = 20.
• 4013 – balanced prime
• 4019 – Sophie Germain prime
• 4028 – sum of the first 45 primes
• 4030 – third weird number
• 4031 – sum of the cubes of the first six primes
• 4032 – pronic number
• 4033 – sixth super-Poulet number; strong pseudoprime in base 2
• 4060 – tetrahedral number
• 4073 – Sophie Germain prime
• 4079 – safe prime
• 4092 - an occasional glitch in the game The Legend of Zelda: Ocarina of Time causes the Gossip Stones to say this number
• 4095 – triangular number, odd abundant number, Mersenne number
• 4096 – power of two $2^{12}$; $64^2$; 16th cube; smallest number with exactly 13 divisors; a superperfect number
• 4104 – $2^3+16^3=9^3+15^3$ (taxicab number)
• 4127 – safe prime
• 4139 – safe prime
• 4140 – Bell number
• 4141 – centered square number
• 4147 – smallest cyclic number in duodecimal
• 4160 – pronic number
• 4166 – centered heptagonal number, 7! − 6! − 5! − 4! − 3! − 2! − 1! − 0!
• 4167 – 7! − 6! − 5! − 4! − 3! − 2! − 1!
• 4168 – 7! − 6! − 5! − 4! − 3! − 2!
• 4170 – 7! − 6! − 5! − 4! − 3!
• 4176 – 7! − 6! − 5! − 4!
• 4181 – Fibonacci number, Markov number
• 4186 – triangular number
• 4187 – factor of R₁₃. Also record number of wickets taken in first-class cricket by Wilfred Rhodes.
• 4199 – highly cototient number, product of three consecutive primes
• 4200 – nonagonal number, pentagonal pyramidal number, 7! − 6! − 5!
• 4210 – 11th semi-meandric number
• 4211 – Sophie Germain prime
• 4219 – cuban prime of the form x = y + 1
• 4223 – Kynea number
• 4225 – $65^2$, centered octagonal number
• 4227 – sum of the first 46 primes
• 4240 – Leyland number
• 4257 – decagonal number
• 4259 – safe prime
• 4271 – Sophie Germain prime
• 4278 – triangular number
• 4283 – safe prime
• 4289 – highly cototient number
• 4290 – pronic number
• 4320 – 7! − 6!
• 4324 – 23rd square pyramidal number
• 4325 – centered square number
• 4349 – Sophie Germain prime
• 4356 – $66^2$, sum of the cubes of the first eleven integers
• 4359 – perfect totient number
• 4369 – seventh super-Poulet number
• 4371 – triangular number
• 4373 – Sophie Germain prime
• 4375 – perfect totient number (the smallest not divisible by 3)
• 4391 – Sophie Germain prime
• 4397 – Year of Comet Hale–Bopp's return, a prime number
• 4400 – the number of missing persons in the sci-fi show The 4400
• 4409 – Sophie Germain prime, highly cototient number, balanced prime
• 4411 – centered heptagonal number
• 4421 – alternating factorial
• 4422 – pronic number
• 4438 – sum of the first 47 primes
• 4446 – nonagonal number
• 4447 – cuban prime of the form x = y + 1
• 4457 – balanced prime
• 4465 – triangular number
• 4481 – Sophie Germain prime
• 4489 – $67^2$, centered octagonal number
• 4495 – tetrahedral number
• 4503 – largest number not the sum of four or fewer squares of composites
• 4505 – fifth Zeisel number
• 4513 – centered square number
• 4522 – decagonal number
• 4547 – safe prime
• 4556 – pronic number
• 4560 – triangular number
• 4579 – octahedral number
• 4597 – balanced prime
• 4607 – Woodall number
• 4619 – highly cototient number
• 4624 – $68^2$
• 4641 – magic constant of n×n normal magic square and n-queens problem for n = 21.
• 4656 – triangular number
• 4657 – balanced prime
• 4661 – sum of the first 48 primes
• 4663 – centered heptagonal number
• 4679 – safe prime
• 4681 – eighth super-Poulet number
• 4691 – balanced prime
• 4692 – pronic number
• 4699 – nonagonal number
• 4703 – safe prime
• 4705 – $48^2+49^2=17^2+18^2+\cdots +26^2$, centered square number
• 4727 – sum of the squares of the first twelve primes
• 4733 – Sophie Germain prime
• 4753 – triangular number
• 4761 – $69^2$, centered octagonal number
• 4787 – safe prime
• 4788 – 14th Keith number
• 4793 – Sophie Germain prime
• 4795 – decagonal number
• 4799 – safe prime
• 4801 – cuban prime of the form x = y + 2, smallest prime with a composite sum of digits in base 7
• 4830 – pronic number
• 4851 – triangular number, pentagonal pyramidal number
• 4862 – Catalan number
• 4871 – Sophie Germain prime
• 4879 – 11th Kaprekar number
• 4888 – sum of the first 49 primes
• 4900 – $70^2$, the only square-pyramidal square other than 1[1]
• 4901 – centered square number
• 4913 – 17th cube
• 4919 – Sophie Germain prime, safe prime
• 4922 – centered heptagonal number
• 4941 – centered cube number
• 4943 – Sophie Germain prime
• 4950 – triangular number, 12th Kaprekar number
• 4959 – nonagonal number
• 4960 – tetrahedral number; greater of fourth pair of Smith brothers
• 4970 – pronic number
• 4991 – Lucas–Carmichael number
• 4993 – balanced prime