809804 has 12 divisors (see below), whose sum is σ = 1423464. Its totient is φ = 403104.

The previous prime is 809803. The next prime is 809821. The reversal of 809804 is 408908.

809804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (809801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544 + ... + 2000.

It is an arithmetic number, because the mean of its divisors is an integer number (118622).

2⁸⁰⁹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

809804 is a deficient number, since it is larger than the sum of its proper divisors (613660).

809804 is a wasteful number, since it uses less digits than its factorization.

809804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 809804 is about 899.8911045232. The cubic root of 809804 is about 93.2094558366.

The spelling of 809804 in words is "eight hundred nine thousand, eight hundred four".