9045

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Number

$9045$ (nine thousand and forty-five) is:

$3^3 \times 5 \times 67$


The $134$th triangular number after $1$, $3$, $6$, $10$, $15$, $\ldots$, $7503$, $7626$, $7750$, $7875$, $8001$, $8128$, $8256$, $8385$, $8515$, $8646$, $8778$, $8911$:
$9045 = \ds \sum_{k \mathop = 1}^{134} k = \dfrac {134 \times \paren {134 + 1} } 2$


Also see