4000

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

List of numbers — Integers ← 1k 2k 3k 4k 5k 6k 7k 8k 9k →
Cardinal	4000 four thousand
Ordinal	4000th four thousandth
Factorization
Roman numeral	MMMM
Roman numeral (Unicode)	MMMM, mmmm
Binary	111110100000
Octal	7640
Duodecimal	2394
Hexadecimal	FA0

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 - 3rd weird number
• 4031 - sum of the cubes of the first six primes
• 4033 - 6th super-Poulet number; strong pseudoprime in base 2
• 4060 - tetrahedral number
• 4073 - Sophie Germain prime
• 4079 - safe prime
• 4095 - triangular number, the largest one of the form 2^k − 1
• 4096 - power of two 2¹²; 64²; 16th cube; smallest number with exactly 13 divisors; a superperfect number
• 4104 - 2³ + 16³ = 9³ + 15³ (taxicab number)
• 4127 - safe prime
• 4139 - safe prime
• 4140 - Bell 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
• 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 - 65², 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
• 4320 - 7!-6!
• 4324 - 23rd square pyramidal number
• 4349 - Sophie Germain prime
• 4356 - 66², sum of the cubes of the first eleven integers
• 4359 - perfect totient number
• 4369 - 7th 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
• 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 - 67², centered octagonal number
• 4495 - tetrahedral number
• 4503 - largest number not the sum of four or fewer squares of composites
• 4505 - 5th Zeisel number
• 4522 - decagonal number
• 4547 - safe prime
• 4560 - triangular number
• 4579 - octahedral number
• 4597 - balanced prime
• 4607 - Woodall number
• 4619 - highly cototient number
• 4620 - the number appearing on all cheques in the Check Game (aka Blank Check) on the U.S. TV game show The Price Is Right
• 4624 - 68²
• 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 - 8th super-Poulet number
• 4691 - balanced prime
• 4699 - nonagonal number
• 4703 - safe prime
• 4705 -
• 4727 - sum of the squares of the first twelve primes
• 4733 - Sophie Germain prime
• 4753 - triangular number
• 4761 - 69², 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
• 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 - 70², the only square-pyramidal square other than 1[1]
• 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 4th pair of Smith brothers
• 4991 - Lucas-Carmichael number
• 4993 - balanced prime