188

Number
$188$ (one hundred and eighty-eight) is:


 * $2^2 \times 47$


 * The $10$th untouchable number after $2, 5, 52, 88, 96, 120, 124, 146, 162$.


 * The $27$th nontotient:
 * $\nexists m \in \Z_{>0}: \phi \left({m}\right) = 188$
 * where $\phi \left({m}\right)$ denotes the Euler $\phi$ function


 * The $29$th happy number after $1, 7, 10, 13, 19, 23, \ldots, 91, 94, 97, 100, 103, 109, 129, 130, 133, 139, 167, 176$:
 * $188 \to 1^2 + 8^2 + 8^2 = 1 + 64 + 64 = 129 \to 1^2 + 2^2 + 9^2 = 1 + 4 + 81 = 86 \to 8^2 + 6^2 = 64 + 36 = 100 \to 1^2 + 0^2 + 0^2 = 1$