9139
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Number
$9139$ (nine thousand, one hundred and thirty-nine) is:
- $13 \times 19 \times 37$
- The $37$th tetrahedral number, after $1$, $4$, $10$, $20$, $35$, $\ldots$, $3276$, $3276$, $4060$, $4495$, $4960$, $5456$, $5984$, $6545$, $7140$, $7770$, $8436$:
- $9139 = \ds \sum_{k \mathop = 1}^{37} \frac {k \paren {k + 1} } 2 = \dfrac {37 \paren {37 + 1} \paren {37 + 2} } 6$