230

Number
$230$ (two hundred and thirty) is:


 * $2 \times 5 \times 23$


 * The $33$rd nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 230$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $37$th happy number after $1, 7, 10, 13, 19, 23, \ldots, 130, 133, 139, 167, 176, 188, 190, 192, 193, 203, 208, 219, 226$:
 * $230 \to 2^2 + 3^2 + 0^2 = 4 + 9 + 0 = 13 \to 1^2 + 3^2 = 1 + 9 = 10 \to 1^2 + 0^2 = 1$


 * There are $230$ Fedorov groups, if chiral copies are considered distinct.

Also see

 * 230 Fedorov Groups where Chiral Pairs are Distinct