685912 has 16 divisors (see below), whose sum is σ = 1302840. Its totient is φ = 338496.

The previous prime is 685907. The next prime is 685939. The reversal of 685912 is 219586.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

685912 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, 148 + ... + 1180.

2⁶⁸⁵⁹¹² is an apocalyptic number.

It is an amenable number.

685912 is a deficient number, since it is larger than the sum of its proper divisors (616928).

685912 is a wasteful number, since it uses less digits than its factorization.

685912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1118 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 685912 is about 828.1980439484. The cubic root of 685912 is about 88.1907021391.

The spelling of 685912 in words is "six hundred eighty-five thousand, nine hundred twelve".