4447

Number
$4447$ (four thousand, four hundred and forty-seven) is:


 * The $604$th prime number


 * The $39$th centered hexagonal number after $1$, $7$, $19$, $37$, $61$, $91$, $127$, $\ldots$, $2791$, $2977$, $3169$, $3367$, $3571$, $3781$, $3997$, $4219$:
 * $4447 = \displaystyle 1 + \sum_{k \mathop = 1}^{39 - 1} 6 k = 39^3 - 38^3$