864812 has 12 divisors (see below), whose sum is σ = 1629936. Its totient is φ = 399120.

The previous prime is 864811. The next prime is 864817. The reversal of 864812 is 218468.

It is not an unprimeable number, because it can be changed into a prime (864811) 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, 8264 + ... + 8367.

It is an arithmetic number, because the mean of its divisors is an integer number (135828).

2⁸⁶⁴⁸¹² is an apocalyptic number.

It is an amenable number.

864812 is a deficient number, since it is larger than the sum of its proper divisors (765124).

864812 is a wasteful number, since it uses less digits than its factorization.

864812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16648 (or 16646 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 864812 is about 929.9526869685. The cubic root of 864812 is about 95.2738910363.

The spelling of 864812 in words is "eight hundred sixty-four thousand, eight hundred twelve".