1335

Number
$1335$ (one thousand, three hundred and thirty-five) is:


 * $3 \times 5 \times 89$


 * The $30$th pentagonal number after $1$, $5$, $12$, $22$, $35$, $\ldots$, $477$, $532$, $590$, $651$, $715$, $782$, $852$, $925$, $1001$, $1080$, $1162$, $1247$:
 * $1335 = \displaystyle \sum_{k \mathop = 1}^{30} \left({3 k - 2}\right) = \dfrac {30 \left({3 \times 30 - 1}\right)} 2$