1953

Number
$1953$ (one thousand, nine hundred and fifty-three) is:
 * $3^2 \times 7 \times 31$


 * The $62$nd triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $1326$, $1378$, $1431$, $1485$, $1540$, $1596$, $1653$, $1711$, $1770$, $1770$, $1830$, $1891$:
 * $1953 = \displaystyle \sum_{k \mathop = 1}^{62} k = \dfrac {62 \times \left({62 + 1}\right)} 2$