685924 has 6 divisors (see below), whose sum is σ = 1200374. Its totient is φ = 342960.

The previous prime is 685907. The next prime is 685939. The reversal of 685924 is 429586.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 589824 + 96100 = 768^2 + 310^2 .

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 685924.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 85737 + ... + 85744.

2⁶⁸⁵⁹²⁴ is an apocalyptic number.

It is an amenable number.

685924 is a deficient number, since it is larger than the sum of its proper divisors (514450).

685924 is a wasteful number, since it uses less digits than its factorization.

685924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171485 (or 171483 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 685924 is about 828.2052885608. The cubic root of 685924 is about 88.1912164336.

The spelling of 685924 in words is "six hundred eighty-five thousand, nine hundred twenty-four".