40000 (number)

← 39999 40000 40001 →
List of numbers — Integers ← 0 10k 20k 30k 40k 50k 60k 70k 80k 90k →
Cardinal	forty thousand
Ordinal	40000th (forty thousandth)
Factorization	2^6× 5^4
Roman numeral	XL
Binary	10011100010000002
Ternary	20002121113
Quaternary	213010004
Quinary	22400005
Senary	5051046
Octal	1161008
Duodecimal	1B19412
Hexadecimal	9C4016
Vigesimal	500020
Base 36	UV436

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 – Ryle 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