2176

Number
$2176$ (two thousand, one hundred and seventy-six) is:


 * $2^7 \times 17$


 * The $16$th pentagonal pyramidal number after $1, 6, 12, 40, 75, 126, 196, 288, 405, 550, 726, 936, 1183, 1470, 1800$:
 * $2176 = \displaystyle \sum_{k \mathop = 1}^{16} \dfrac {k \left({3 k - 1}\right)} 2 = \dfrac {16^2 \left({16 + 1}\right)} 2$