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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== * 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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「40000 (number)」の詳細全文を読む スポンサード リンク
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