Supriya Ghosh (Editor)

40000 (number)

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← 39999
  
40000

Cardinal
  
forty thousand

Roman numeral
  
XL

40000
  
40001 →

Factorization
  
2× 5

Ordinal
  
40000th (forty thousandth)

40,000 (forty thousand) is the natural number that comes after 39,999 and before 40,001. It is the square of 200.

Selected numbers in the range 40000–49999

  • 40000 – round number, 2002
  • 40320 – smallest factorial that is not a highly composite number
  • 40425 – square pyramidal number
  • 40585 – largest factorion
  • 40678 – pentagonal pyramidal number
  • 40804 – palindromic square
  • 41041 – Carmichael number
  • 41616 – triangular square number
  • 41835 – Motzkin number
  • 42680 – octahedral number
  • 42875 – 353
  • 42925 – square pyramidal number
  • 43261 – Markov number
  • 43560 – pentagonal pyramidal number
  • 43691 – Wagstaff prime
  • 44100 – sum of the cubes of the first 20 positive integers, sampling rate of Red Book-compliant audio compact disks
  • 44721 – When n > 44721, the expression 1/n − 1/n + 2 drops down to fractions of a billionth. The corresponding sum in the Leibniz formula for pi is 0.785386986.
  • 44944 – palindromic square
  • 45360 – highly composite number; first number to have 100 factors (including one and itself)
  • 46233 – sum of the first eight factorials
  • 46368 – Fibonacci number
  • 46656 – 66
  • 46657 – Carmichael number
  • 46664 – Nelson Mandela's prisoner number
  • 47058 – primary pseudoperfect number
  • 47806 – in hexadecimal it is written as "BABE"
  • 49151 – Woodall number
  • 49726 – pentagonal pyramidal number

    • References

    40000 (number) Wikipedia
    (Text) CC BY-SA