818904 has 32 divisors (see below), whose sum is σ = 2070000. Its totient is φ = 269952.

The previous prime is 818897. The next prime is 818947. The reversal of 818904 is 409818.

It is a happy number.

It is a super-2 number, since 2×818904² = 1341207522432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3462 + ... + 3690.

2⁸¹⁸⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

818904 is an abundant number, since it is smaller than the sum of its proper divisors (1251096).

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

818904 is a wasteful number, since it uses less digits than its factorization.

818904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 818904 is about 904.9331467020. The cubic root of 818904 is about 93.5572966135.

The spelling of 818904 in words is "eight hundred eighteen thousand, nine hundred four".