3916

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Number

$3916$ (three thousand, nine hundred and sixteen) is:

$2^2 \times 11 \times 89$

The $88$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $3240$, $3321$, $3403$, $3486$, $3570$, $3655$, $3741$, $3828$:

$3916 = \ds \sum_{k \mathop = 1}^{88} k = \dfrac {88 \times \paren {88 + 1} } 2$

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