864685 has 16 divisors (see below), whose sum is σ = 1108224. Its totient is φ = 646272.

The previous prime is 864679. The next prime is 864691. The reversal of 864685 is 586468.

It is an interprime number because it is at equal distance from previous prime (864679) and next prime (864691).

It is a cyclic number.

It is not a de Polignac number, because 864685 - 2¹⁵ = 831917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8344 + ... + 8446.

It is an arithmetic number, because the mean of its divisors is an integer number (69264).

2⁸⁶⁴⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

864685 is a deficient number, since it is larger than the sum of its proper divisors (243539).

864685 is a wasteful number, since it uses less digits than its factorization.

864685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

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

The square root of 864685 is about 929.8844014177. The cubic root of 864685 is about 95.2692270645.

The spelling of 864685 in words is "eight hundred sixty-four thousand, six hundred eighty-five".