1854

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Number

$1854$ (one thousand, eight hundred and fifty-four) is:

$2 \times 3^2 \times 103$


The $7$th subfactorial after $0$, $1$, $2$, $9$, $44$, $265$:
$1854 = \, !7 = 7! \paren {1 - \dfrac 1 {1!} + \dfrac 1 {2!} - \dfrac 1 {3!} + \dfrac 1 {4!} - \dfrac 1 {5!} + \dfrac 1 {6!} - \dfrac 1 {7!} }$


Also see


Sources