868687 has 8 divisors (see below), whose sum is σ = 915840. Its totient is φ = 822360.

The previous prime is 868669. The next prime is 868691. The reversal of 868687 is 786868.

It is a happy number.

868687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 868687 - 2⁷ = 868559 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4012 + ... + 4222.

It is an arithmetic number, because the mean of its divisors is an integer number (114480).

2⁸⁶⁸⁶⁸⁷ is an apocalyptic number.

868687 is a deficient number, since it is larger than the sum of its proper divisors (47153).

868687 is a wasteful number, since it uses less digits than its factorization.

868687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413.

The product of its digits is 129024, while the sum is 43.

The square root of 868687 is about 932.0337976704. The cubic root of 868687 is about 95.4159782902.

The spelling of 868687 in words is "eight hundred sixty-eight thousand, six hundred eighty-seven".