396

396 = 2 x 2 x 3 x 3 x 11.

396 is a nonagonal number.

396 is the number of positions in a 3 x 3 sliding puzzle that require exactly 11 moves to solve starting with the hole in a corner.

396 is 112200 in base 3 and 1500 in base 6.

396 is the sum of a twin prime pair: 396 = 197 + 199.

396 refers to the displacement in cubic inches of early Chevrolet Big-Block engines.

Source: What's Special About This Number?