2059

Number
$2059$ (two thousand and fifty-nine) is:
 * $29 \times 71$


 * The $29$th heptagonal number after $1$, $7$, $18$, $34$, $55$, $81$, $112$, $\ldots$, $874$, $970$, $1071$, $1177$, $1288$, $1404$, $1525$, $1651$, $1782$, $1918$:
 * $2059 = \ds \sum_{k \mathop = 1}^{29} \paren {5 k - 4} = \dfrac {29 \paren {5 \times 29 - 3} } 2$