394

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Number

$394$ (three hundred and ninety-four) is:

$2 \times 197$

The $3$rd candidate Lychrel number.

The $40$th noncototient after $10$, $26$, $34$, $50$, $\ldots$, $344$, $346$, $362$, $366$, $372$, $386$:

$\nexists m \in \Z_{>0}: m - \map \phi m = 394$

where $\map \phi m$ denotes the Euler $\phi$ function

Also see

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