812 = 22 x 7 x 29. It is the product of a prime and the previous number (two consecutive integers): 812 = 28 x 29.
812 is a pronic number.
812 is the number of triangles of any size contained in a triangle of side 14 on a triangular grid.
The sum of the base 3 digits of 812 equals the sum of the base 9 digits of 812: (1 + 0 + 1 + 0 + 0 + 0 + 2) = (1 + 1 + 0 + 2) = 4.
Telephone area code 812 covers the southern part of Indiana.
