686958 has 8 divisors (see below), whose sum is σ = 1373928. Its totient is φ = 228984.

The previous prime is 686947. The next prime is 686963. The reversal of 686958 is 859686.

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

686958 is an admirable number.

It is a super-2 number, since 2×686958² = 943822587528, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

686958 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 57241 + ... + 57252.

It is an arithmetic number, because the mean of its divisors is an integer number (171741).

2⁶⁸⁶⁹⁵⁸ is an apocalyptic number.

686958 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

686958 is a wasteful number, since it uses less digits than its factorization.

686958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114498.

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

The square root of 686958 is about 828.8292948491. The cubic root of 686958 is about 88.2355089668.

The spelling of 686958 in words is "six hundred eighty-six thousand, nine hundred fifty-eight".