9139

Number
$9139$ (nine thousand, one hundred and thirty-nine) is:


 * $13 \times 19 \times 37$


 * The $37$th tetrahedral number, after $1$, $4$, $10$, $20$, $35$, $\ldots$, $3276$, $3276$, $4060$, $4495$, $4960$, $5456$, $5984$, $6545$, $7140$, $7770$, $8436$:
 * $9139 = \displaystyle \sum_{k \mathop = 1}^{37} \frac {k \left({k + 1}\right)} 2 = \dfrac {37 \left({37 + 1}\right) \left({37 + 2}\right)} 6$