366

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Number

$366$ (three hundred and sixty-six) is:

$2 \times 3 \times 61$

The $4$th integer solution to $\map {\sigma_1} n = \map {\sigma_1} {n + 2}$ after $33$, $54$, $284$:

$\map {\sigma_1} {366} = 744 = \map {\sigma_1} {368}$

The $37$th noncototient after $10$, $26$, $34$, $50$, $\ldots$, $290$, $292$, $298$, $310$, $326$, $340$, $344$, $346$, $362$:

$\nexists m \in \Z_{>0}: m - \map \phi m = 366$

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

The $39$th sphenic number after $30$, $42$, $66$, $70$, $\ldots$, $290$, $310$, $318$, $322$, $345$, $354$, $357$:

$366 = 2 \times 3 \times 61$

Also see

• Previous  ... Next: Integers Differing by 2 with Same Divisor Sum
• Previous  ... Next: Sphenic Number
• Previous  ... Next: Noncototient

Historical Note

There are $366$ days in a leap year in the Gregorian calendar.