3186

Number
$3186$ (three thousand, one hundred and eighty-six) is:
 * $2 \times 3^3 \times 59$


 * The $36$th heptagonal number after $1, 7, 18, 34, 55, 81, 112, \ldots, 2205, 2356, 2512, 2673, 2839, 3010$:
 * $3186 = \displaystyle \sum_{k \mathop = 1}^{36} \left({5 k - 4}\right) = \dfrac {36 \left({5 \times 36 - 3}\right)} 2$