465

Number
$465$ (four hundred and sixty-five) is:


 * $3 \times 5 \times 31$


 * The $30$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $325$, $351$, $378$, $406$, $435$:
 * $465 = \displaystyle \sum_{k \mathop = 1}^{30} k = \dfrac {30 \times \left({30 + 1}\right)} 2$