2839

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Number

$2839$ (two thousand, eight hundred and thirty-nine) is:

$17 \times 167$

The $34$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $2205$, $2356$, $2512$, $2673$:

$2839 = \ds \sum_{k \mathop = 1}^{34} \paren {5 k - 4} = \dfrac {34 \paren {5 \times 34 - 3} } 2$

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