1326

Number
$1326$ (one thousand, three hundred and twenty-six) is:
 * $2 \times 13 \times 51$


 * The $26$th hexagonal number after $1, 6, 15, 28, 45, 66, 91, \ldots, 703, 780, 861, 946, 1035, 1225$:
 * $1326 = \displaystyle \sum_{k \mathop = 1}^{26} \left({4 k - 3}\right) = 26 \left({2 \times 26 - 1}\right)$


 * The $5$th hexamorphic number after $1, 45, 66, 1225$:
 * $1326 = H_{26}$