9727

9727 = 71 x 137.

9727 is 302402 in base 5.

9727 divides 72¹⁷ - 1.

9727 is a number that cannot be written as the sum of three squares.

13 x 9727² + 13 x 9727 + 1 is a square (A104240).

Source: OEIS