1918

Number
$1918$ (one thousand, nine hundred and eighteen) is:
 * $2 \times 7 \times 137$


 * The $28$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $874$, $970$, $1071$, $1177$, $1288$, $1404$, $1525$, $1651$, $1782$:
 * $1918 = \displaystyle \sum_{k \mathop = 1}^{28} \left({5 k - 4}\right) = \dfrac {28 \left({5 \times 28 - 3}\right)} 2$