874

Number
$874$ (eight hundred and seventy-four) is:
 * $2 \times 19 \times 23$


 * The $19$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $148$, $189$, $235$, $286$, $342$, $403$, $469$, $540$, $616$, $697$, $783$:
 * $874 = \displaystyle \sum_{k \mathop = 1}^{19} \left({5 k - 4}\right) = \dfrac {19 \left({5 \times 19 - 3}\right)} 2$