2470

Number
$2470$ (two thousand, four hundred and seventy) is:


 * $2 \times 5 \times 13 \times 19$


 * The $19$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $1015$, $1240$, $1496$, $1785$, $2109$:
 * $2470 = \displaystyle \sum_{k \mathop = 1}^{19} k^2 = \dfrac {19 \left({19 + 1}\right) \left({2 \times 19 + 1}\right)} 6$