1183

Number
$1183$ (one thousand, one hundred and eighty-three) is:


 * $7 \times 13^2$


 * The $13$th pentagonal pyramidal number after $1, 6, 12, 40, 75, 126, 196, 288, 405, 550, 726, 936$:
 * $1183 = \displaystyle \sum_{k \mathop = 1}^{13} \dfrac {k \left({3 k - 1}\right)} 2 = \dfrac {13^2 \left({13 + 1}\right)} 2$