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
- Previous ... Next: Subfactorial
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1854$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1854$