809004 has 24 divisors (see below), whose sum is σ = 2157568. Its totient is φ = 231120.

The previous prime is 808993. The next prime is 809023. The reversal of 809004 is 400908.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

809004 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 7 ways as a sum of consecutive naturals, for example, 4732 + ... + 4899.

2⁸⁰⁹⁰⁰⁴ is an apocalyptic number.

809004 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

809004 is an abundant number, since it is smaller than the sum of its proper divisors (1348564).

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

809004 is a wasteful number, since it uses less digits than its factorization.

809004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9645 (or 9643 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 809004 is about 899.4464964632. The cubic root of 809004 is about 93.1787520560.

The spelling of 809004 in words is "eight hundred nine thousand, four".