1413 is the smallest number that cannot be formed using the digits 0 to 7 at most once, together with the arithmetic operations (symbols) +. -. *, and / (A060315).
1413 has a representation as a sum of two squares: 1413 = 182 + 332.
1413 is 999 in base 12 (A048336). It is 585 in base 16.
1413 has the representation 1413 = 2 x 36 - 45.
Source: What's Special About This Number?
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