864879 has 4 divisors (see below), whose sum is σ = 1153176. Its totient is φ = 576584.

The previous prime is 864817. The next prime is 864883. The reversal of 864879 is 978468.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 864879 - 2⁸ = 864623 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 864879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864079) 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, 144144 + ... + 144149.

It is an arithmetic number, because the mean of its divisors is an integer number (288294).

2⁸⁶⁴⁸⁷⁹ is an apocalyptic number.

864879 is a deficient number, since it is larger than the sum of its proper divisors (288297).

864879 is a wasteful number, since it uses less digits than its factorization.

864879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288296.

The product of its digits is 96768, while the sum is 42.

The square root of 864879 is about 929.9887096089. The cubic root of 864879 is about 95.2763513729.

The spelling of 864879 in words is "eight hundred sixty-four thousand, eight hundred seventy-nine".