3744

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


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