1160

Number
$1160$ (one thousand, one hundred and sixty) is:


 * $2^3 \times 5 \times 29$


 * The $20$th octagonal number, after $1$, $8$, $21$, $40$, $65$, $96$, $133$, $176$, $225$, $280$, $341$, $408$, $481$, $560$, $645$, $736$, $833$, $936$, $1045$:
 * $1160 = \displaystyle \sum_{k \mathop = 1}^{20} \paren {6 k - 5} = 20 \paren {3 \times 20 - 2}$