1918

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


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