810904 has 8 divisors (see below), whose sum is σ = 1520460. Its totient is φ = 405448.

The previous prime is 810893. The next prime is 810907. The reversal of 810904 is 409018.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810907) 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 as a sum of consecutive naturals, namely, 50674 + ... + 50689.

2⁸¹⁰⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

810904 is a deficient number, since it is larger than the sum of its proper divisors (709556).

810904 is a wasteful number, since it uses less digits than its factorization.

810904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101369 (or 101365 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 810904 is about 900.5020821742. The cubic root of 810904 is about 93.2516405349.

The spelling of 810904 in words is "eight hundred ten thousand, nine hundred four".