816812 has 12 divisors (see below), whose sum is σ = 1468320. Its totient is φ = 397296.

The previous prime is 816811. The next prime is 816817. The reversal of 816812 is 218618.

It is not an unprimeable number, because it can be changed into a prime (816811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2612 + ... + 2907.

It is an arithmetic number, because the mean of its divisors is an integer number (122360).

2⁸¹⁶⁸¹² is an apocalyptic number.

It is an amenable number.

816812 is a deficient number, since it is larger than the sum of its proper divisors (651508).

816812 is a wasteful number, since it uses less digits than its factorization.

816812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560 (or 5558 counting only the distinct ones).

The product of its digits is 768, while the sum is 26.

The square root of 816812 is about 903.7765210493. The cubic root of 816812 is about 93.4775604591.

The spelling of 816812 in words is "eight hundred sixteen thousand, eight hundred twelve".