40,000
40,000 (forty thousand) is the natural number that comes after 39,999 and before 40,001. It is the square of 200.
| ||||
|---|---|---|---|---|
| Cardinal | forty thousand | |||
| Ordinal | 40000th (forty thousandth) | |||
| Factorization | 26 × 54 | |||
| Divisors | 35 total | |||
| Greek numeral | ||||
| Roman numeral | XL | |||
| Binary | 10011100010000002 | |||
| Ternary | 20002121113 | |||
| Senary | 5051046 | |||
| Octal | 1161008 | |||
| Duodecimal | 1B19412 | |||
| Hexadecimal | 9C4016 | |||
Selected numbers in the range 40001–49999
40001 to 40999
- 40320 = smallest factorial (8!) that is not a highly composite number
- 40425 = square pyramidal number
- 40585 = largest factorion[1]
- 40678 = pentagonal pyramidal number
- 40804 = palindromic square
41000 to 41999
- 41041 = Carmichael number[2]
- 41472 = 3-smooth number
- 41586 = Large Schröder number
- 41616 = triangular square number[3]
- 41835 = Motzkin number[4]
- 41841 = 1/41841 = 0.0000239 is a repeating decimal with period 7.
42000 to 42999
- 42680 = octahedral number[5]
- 42875 = 353
- 42925 = square pyramidal number
43000 to 43999
- 43261 = Markov number[6]
- 43390 = number of primes .[7]
- 43560 = pentagonal pyramidal number
- 43691 = Wagstaff prime[8]
- 43777 = smallest member of a prime sextuplet
44000 to 44999
- 44044 = palindrome of 79 after 6 iterations of the "reverse and add" iterative process[9]
- 44100 = sum of the cubes of the first 20 positive integers. 44,100 Hz is a common sampling frequency in digital audio (and is the standard for compact discs).
- 44444 = repdigit
- 44721 = smallest positive integer such that the expression 1/n − 1/n + 2 ≤ 10−9
- 44944 = palindromic square
45000 to 45999
- 45360 = highly composite number;[10] first number to have 100 factors (including one and itself)
46000 to 46999
- 46233 = sum of the first eight factorials
- 46368 = Fibonacci number[11]
- 46656 = 363, 66, 3-smooth number
- 46657 = Carmichael number[2]
47000 to 47999
- 47058 = primary pseudoperfect number[12]
- 47160 = 10-th derivative of xx at x=1[13]
- 47321/33461 ≈ √2
49000 to 49999
- 49151 = Woodall number[14]
- 49152 = 3-smooth number
- 49726 = pentagonal pyramidal number
References
- "Sloane's A014080 : Factorions". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A002997 : Carmichael numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A001110 : Square triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A001006 : Motzkin numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A002559 : Markoff (or Markov) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- Sloane, N. J. A. (ed.). "Sequence A007053". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-06-02.
- "Sloane's A000979 : Wagstaff primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Reversal-Addition Palindrome Test on 79".
- "Sloane's A002182 : Highly composite numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- "Sloane's A054377 : Primary pseudoperfect numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
- Sloane, N. J. A. (ed.). "Sequence A005727". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- "Sloane's A003261 : Woodall numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
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