438

Number
$438$ (four hundred and thirty-eight) is:


 * $2 \times 3 \times 73$


 * The $53$rd sphenic number after $30$, $42$, $66$, $70$, $\ldots$, $385$, $399$, $402$, $406$, $410$, $418$, $426$, $429$, $430$, $434$, $435$:
 * $438 = 2 \times 3 \times 73$


 * The $18$th Smith number after $4$, $22$, $27$, $58$, $85$, $94$, $121$, $166$, $202$, $265$, $274$, $319$, $346$, $355$, $378$, $382$, $391$:
 * $4 + 3 + 8 = 2 + 3 + 7 + 3 = 15$

Also see