1457

Number
$1457$ (one thousand, four hundred and fifty-seven) is:
 * $31 \times 47$


 * The $31$st second pentagonal number after $2$, $7$, $15$, $26$, $\ldots$, $610$, $672$, $737$, $805$, $876$, $950$, $1027$, $1107$, $1190$, $1276$, $1365$:
 * $1457 = \dfrac {31 \left({3 \times 31 + 1}\right)} 2$