1330

Number
$1330$ (one thousand, three hundred and thirty) is:
 * $2 \times 5 \times 7 \times 19$


 * The $19$th tetrahedral number, after $1$, $4$, $10$, $20$, $35$, $56$, $84$, $120$, $165$, $220$, $286$, $364$, $455$, $560$, $680$, $816$, $969$, $1140$:
 * $1330 = \displaystyle \sum_{k \mathop = 1}^{19} \frac {k \left({k + 1}\right)} 2 = \dfrac {19 \left({19 + 1}\right) \left({19 + 2}\right)} 6$