864689 has 4 divisors (see below), whose sum is σ = 988224. Its totient is φ = 741156.

The previous prime is 864679. The next prime is 864691. The reversal of 864689 is 986468.

864689 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 864689 - 2⁴ = 864673 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon 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, 61757 + ... + 61770.

It is an arithmetic number, because the mean of its divisors is an integer number (247056).

2⁸⁶⁴⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

864689 is a deficient number, since it is larger than the sum of its proper divisors (123535).

864689 is a wasteful number, since it uses less digits than its factorization.

864689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123534.

The product of its digits is 82944, while the sum is 41.

The square root of 864689 is about 929.8865522202. The cubic root of 864689 is about 95.2693739682.

The spelling of 864689 in words is "eight hundred sixty-four thousand, six hundred eighty-nine".