412

Number
$412$ (four hundred and twelve) is:


 * $2^2 \times 103$


 * The $4$th positive integer $n$ after $157, 262, 367$ for which $\phi \left({2 n + 1}\right) < \phi \left({2 n}\right)$:
 * $\phi \left({2 \times 412 + 1}\right) = 400, \phi \left({2 \times 412}\right) = 408$