2470
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Number
$2470$ (two thousand, four hundred and seventy) is:
- $2 \times 5 \times 13 \times 19$
- The $19$th square pyramidal number after $1$, $5$, $14$, $30$, $55$, $\ldots$, $1015$, $1240$, $1496$, $1785$, $2109$:
- $2470 = \ds \sum_{k \mathop = 1}^{19} k^2 = \dfrac {19 \paren {19 + 1} \paren {2 \times 19 + 1} } 6$