874

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Number

$874$ (eight hundred and seventy-four) is:

$2 \times 19 \times 23$

The $19$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $148$, $189$, $235$, $286$, $342$, $403$, $469$, $540$, $616$, $697$, $783$:

$874 = \ds \sum_{k \mathop = 1}^{19} \paren {5 k - 4} = \dfrac {19 \paren {5 \times 19 - 3} } 2$

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