686586 has 16 divisors (see below), whose sum is σ = 1407168. Its totient is φ = 223200.

The previous prime is 686563. The next prime is 686593. The reversal of 686586 is 685686.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1150 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (87948).

2⁶⁸⁶⁵⁸⁶ is an apocalyptic number.

686586 is an abundant number, since it is smaller than the sum of its proper divisors (720582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686586 is a wasteful number, since it uses less digits than its factorization.

686586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837.

The product of its digits is 69120, while the sum is 39.

The square root of 686586 is about 828.6048515426. The cubic root of 686586 is about 88.2195790575.

Subtracting from 686586 its reverse (685686), we obtain a square (900 = 30²).

The spelling of 686586 in words is "six hundred eighty-six thousand, five hundred eighty-six".