864659 has 4 divisors (see below), whose sum is σ = 883104. Its totient is φ = 846216.

The previous prime is 864641. The next prime is 864673. The reversal of 864659 is 956468.

864659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864629) 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, 9152 + ... + 9245.

It is an arithmetic number, because the mean of its divisors is an integer number (220776).

2⁸⁶⁴⁶⁵⁹ is an apocalyptic number.

864659 is a deficient number, since it is larger than the sum of its proper divisors (18445).

864659 is a wasteful number, since it uses less digits than its factorization.

864659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18444.

The product of its digits is 51840, while the sum is 38.

The square root of 864659 is about 929.8704210803. The cubic root of 864659 is about 95.2682721793.

Subtracting 864659 from its reverse (956468), we obtain a square (91809 = 303²).

The spelling of 864659 in words is "eight hundred sixty-four thousand, six hundred fifty-nine".