8436

Number
$8436$ (eight thousand, four hundred and thirty-six) is:


 * $2^2 \times 3 \times 19 \times 37$


 * The $36$th tetrahedral number, after $1$, $4$, $10$, $20$, $35$, $\ldots$, $3276$, $3276$, $4060$, $4495$, $4960$, $5456$, $5984$, $6545$, $7140$, $7770$:
 * $8436 = \displaystyle \sum_{k \mathop = 1}^{36} \frac {k \left({k + 1}\right)} 2 = \dfrac {36 \left({36 + 1}\right) \left({36 + 2}\right)} 6$