868689 has 12 divisors (see below), whose sum is σ = 1262976. Its totient is φ = 575352.

The previous prime is 868669. The next prime is 868691. The reversal of 868689 is 986868.

It is not a de Polignac number, because 868689 - 2⁷ = 868561 is a prime.

It is an Ulam number.

868689 is a lucky number.

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, 2184 + ... + 2550.

It is an arithmetic number, because the mean of its divisors is an integer number (105248).

2⁸⁶⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

868689 is a deficient number, since it is larger than the sum of its proper divisors (394287).

868689 is a wasteful number, since it uses less digits than its factorization.

868689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 633 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 868689 is about 932.0348705923. The cubic root of 868689 is about 95.4160515164.

The spelling of 868689 in words is "eight hundred sixty-eight thousand, six hundred eighty-nine".