868659 has 12 divisors (see below), whose sum is σ = 1273608. Its totient is φ = 526240.

The previous prime is 868639. The next prime is 868663. The reversal of 868659 is 956868.

It is not a de Polignac number, because 868659 - 2⁷ = 868531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 868659.

It is not an unprimeable number, because it can be changed into a prime (868639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 834 + ... + 1559.

It is an arithmetic number, because the mean of its divisors is an integer number (106134).

2⁸⁶⁸⁶⁵⁹ is an apocalyptic number.

868659 is a deficient number, since it is larger than the sum of its proper divisors (404949).

868659 is a wasteful number, since it uses less digits than its factorization.

868659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2418 (or 2407 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 868659 is about 932.0187766349. The cubic root of 868659 is about 95.4149531123.

Subtracting 868659 from its reverse (956868), we obtain a square (88209 = 297²).

The spelling of 868659 in words is "eight hundred sixty-eight thousand, six hundred fifty-nine".