685918 has 8 divisors (see below), whose sum is σ = 1050912. Its totient is φ = 335616.

The previous prime is 685907. The next prime is 685939. The reversal of 685918 is 819586.

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

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 3555 + ... + 3742.

It is an arithmetic number, because the mean of its divisors is an integer number (131364).

2⁶⁸⁵⁹¹⁸ is an apocalyptic number.

685918 is a deficient number, since it is larger than the sum of its proper divisors (364994).

685918 is a wasteful number, since it uses less digits than its factorization.

685918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7346.

The product of its digits is 17280, while the sum is 37.

The square root of 685918 is about 828.2016662625. The cubic root of 685918 is about 88.1909592871.

The spelling of 685918 in words is "six hundred eighty-five thousand, nine hundred eighteen".