811904 has 16 divisors (see below), whose sum is σ = 1617720. Its totient is φ = 405888.

The previous prime is 811897. The next prime is 811919. The reversal of 811904 is 409118.

It is a tau number, because it is divible by the number of its divisors (16).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 811904.

It is a congruent number.

It is an unprimeable number.

811904 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3044 + ... + 3299.

2⁸¹¹⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

811904 is a deficient number, since it is larger than the sum of its proper divisors (805816).

811904 is an equidigital number, since it uses as much as digits as its factorization.

811904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6357 (or 6345 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 811904 is about 901.0571568996. The cubic root of 811904 is about 93.2899571685.

The spelling of 811904 in words is "eight hundred eleven thousand, nine hundred four".