864915 has 24 divisors (see below), whose sum is σ = 1459920. Its totient is φ = 437184.

The previous prime is 864911. The next prime is 864917. The reversal of 864915 is 519468.

864915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 864915 - 2² = 864911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7881 + ... + 7989.

It is an arithmetic number, because the mean of its divisors is an integer number (60830).

2⁸⁶⁴⁹¹⁵ is an apocalyptic number.

864915 is a deficient number, since it is larger than the sum of its proper divisors (595005).

864915 is a wasteful number, since it uses less digits than its factorization.

864915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 140 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 864915 is about 930.0080644812. The cubic root of 864915 is about 95.2776732924.

The spelling of 864915 in words is "eight hundred sixty-four thousand, nine hundred fifteen".