812804 has 12 divisors (see below), whose sum is σ = 1506204. Its totient is φ = 382464.

The previous prime is 812761. The next prime is 812807. The reversal of 812804 is 408218.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 123904 = 830^2 + 352^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 812804.

It is not an unprimeable number, because it can be changed into a prime (812807) by changing a digit.

812804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5909 + ... + 6044.

It is an arithmetic number, because the mean of its divisors is an integer number (125517).

2⁸¹²⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

812804 is a deficient number, since it is larger than the sum of its proper divisors (693400).

812804 is a wasteful number, since it uses less digits than its factorization.

812804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11974 (or 11972 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 812804 is about 901.5564319553. The cubic root of 812804 is about 93.3244152477.

The spelling of 812804 in words is "eight hundred twelve thousand, eight hundred four".