864856 has 8 divisors (see below), whose sum is σ = 1621620. Its totient is φ = 432424.

The previous prime is 864817. The next prime is 864883. The reversal of 864856 is 658468.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54046 + ... + 54061.

2⁸⁶⁴⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

864856 is a deficient number, since it is larger than the sum of its proper divisors (756764).

864856 is a wasteful number, since it uses less digits than its factorization.

864856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108113 (or 108109 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 864856 is about 929.9763437852. The cubic root of 864856 is about 95.2755067941.

The spelling of 864856 in words is "eight hundred sixty-four thousand, eight hundred fifty-six".