686858 has 8 divisors (see below), whose sum is σ = 1052352. Its totient is φ = 336076.

The previous prime is 686843. The next prime is 686863. The reversal of 686858 is 858686.

686858 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 Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686858.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560 + ... + 3747.

It is an arithmetic number, because the mean of its divisors is an integer number (131544).

2⁶⁸⁶⁸⁵⁸ is an apocalyptic number.

686858 is a deficient number, since it is larger than the sum of its proper divisors (365494).

686858 is a wasteful number, since it uses less digits than its factorization.

686858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7356.

The product of its digits is 92160, while the sum is 41.

The square root of 686858 is about 828.7689666005. The cubic root of 686858 is about 88.2312272984.

The spelling of 686858 in words is "six hundred eighty-six thousand, eight hundred fifty-eight".