864904 has 16 divisors (see below), whose sum is σ = 1645020. Its totient is φ = 426240.

The previous prime is 864901. The next prime is 864911. The reversal of 864904 is 409468.

It can be written as a sum of positive squares in 2 ways, for example, as 864900 + 4 = 930^2 + 2^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864901) 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, 157 + ... + 1324.

2⁸⁶⁴⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

864904 is a deficient number, since it is larger than the sum of its proper divisors (780116).

864904 is a wasteful number, since it uses less digits than its factorization.

864904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560 (or 1556 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 864904 is about 930.0021505351. The cubic root of 864904 is about 95.2772693764.

The spelling of 864904 in words is "eight hundred sixty-four thousand, nine hundred four".