686874 has 8 divisors (see below), whose sum is σ = 1373760. Its totient is φ = 228956.

The previous prime is 686863. The next prime is 686879. The reversal of 686874 is 478686.

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

686874 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (686879) by changing a digit.

686874 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57234 + ... + 57245.

It is an arithmetic number, because the mean of its divisors is an integer number (171720).

2⁶⁸⁶⁸⁷⁴ is an apocalyptic number.

686874 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.

686874 is a wasteful number, since it uses less digits than its factorization.

686874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114484.

The product of its digits is 64512, while the sum is 39.

The square root of 686874 is about 828.7786194153. The cubic root of 686874 is about 88.2319123933.

The spelling of 686874 in words is "six hundred eighty-six thousand, eight hundred seventy-four".