812

812 is a natural number that follows 811 and precedes 813. It is even and composite. In mathematics, 812 factors as 2^2 × 7 × 29, giving 12 positive divisors. The sum of its divisors is 1680, so the sum of proper divisors is 868; since this exceeds 812, the number is classified as abundant.

In different numeral systems, 812 is written as 1100101100 in binary, 0x32C in hexadecimal, and DCCCXII in Roman numerals.

812 also serves as an area code in the North American Numbering Plan. It covers southern Indiana, including Bloomington and Evansville. To accommodate growing demand, an overlay area code 930 was introduced for the same region.

As a year, 812 AD falls in the early ninth century, a period within the broader Byzantine and early medieval era characterized by various political and cultural developments across Europe and the Mediterranean.