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| 406 (number) ： ウィキペディア英語版 |
400 (number)
400 (four hundred) is the natural number following 399 and preceding 401.
== Mathematical properties ==
400 is the square of 20. 400 is the sum of the powers of 7 from 0 to 3, thus making it a repdigit in base 7 (1111).
A circle is divided into 400 grads, which is equal to 360 degrees and 2π radians. (Degrees and radians are the SI accepted units).
400 is a self number in base 10, since there is no integer that added to the sum of its own digits results in 400. On the other hand, 400 is divisible by the sum of its own base 10 digits, making it a Harshad number.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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