3744

Number
$3744$ (three thousand, seven hundred and forty-four) is:
 * $2^5 \times 3 \times 39$


 * The $39$th heptagonal number after $1, 7, 18, 34, 55, 81, 112, \ldots, 2205, 2356, 2512, 2673, 2839, 3010, 3186, 3367, 3553$:
 * $3744 = \displaystyle \sum_{k \mathop = 1}^{39} \left({5 k - 4}\right) = \dfrac {39 \left({5 \times 39 - 3}\right)} 2$