40,000

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Cardinal	40000
Ordinal	th
Factorization	$2^{6}\cdot 5^{4}$
Greek numeral	${\stackrel {\delta }{\mathrm {M} }}$
Roman numeral	XL
Binary	10011100010000002
Ternary	20002121113
Senary	5051046
Octal	1161008
Duodecimal	1B19412
Hexadecimal	9C4016

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

Selected numbers

• 40000 – round number
• 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
• 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 – first number to have 100 factors (including one and itself)
• 46233 – sum of the first eight factorials
• 46368 – Fibonacci number
• 46656 – $6^{6}$
• 46657 – Carmichael number
• 46664 – Nelson Mandela's prisoner number
• 46853 – Number of customers in the SpongeBob SquarePants episode Patty Hype
• 47058 – primary pseudoperfect number
• 47806 – in hexadecimal it is written as "BABE"
• 49151 – Woodall number
• 49726 – pentagonal pyramidal number