38

Number
$38$ (thirty-eight) is:


 * $2 \times 19$


 * The magic constant of the order 3 magic hexagon.


 * The $4$th nontotient after $14, 26, 34$:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 38$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function