418

Number
$418$ (four hundred and eighteen) is:


 * $2 \times 11 \times 19$


 * The $7$th integer after $1$, $14$, $30$, $105$, $248$, $264$ whose divisor sum divided by its Euler $\phi$ value is a square:
 * $\dfrac {\map {\sigma_1} {418} } {\map \phi {418} } = \dfrac {720} {180} = 4 = 2^2$


 * The $47$th sphenic number after $30$, $42$, $66$, $70$, $\ldots$, $385$, $399$, $402$, $406$, $410$:
 * $418 = 2 \times 11 \times 19$