813804 has 24 divisors (see below), whose sum is σ = 1926960. Its totient is φ = 267264.

The previous prime is 813797. The next prime is 813811. The reversal of 813804 is 408318.

It is an interprime number because it is at equal distance from previous prime (813797) and next prime (813811).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813804.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 412 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (80290).

2⁸¹³⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

813804 is an abundant number, since it is smaller than the sum of its proper divisors (1113156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813804 is a wasteful number, since it uses less digits than its factorization.

813804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 813804 is about 902.1108579327. The cubic root of 813804 is about 93.3626721824.

The spelling of 813804 in words is "eight hundred thirteen thousand, eight hundred four".