685318 has 4 divisors (see below), whose sum is σ = 1027980. Its totient is φ = 342658.

The previous prime is 685301. The next prime is 685319. The reversal of 685318 is 813586.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×685318² = 939321522248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 685318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685319) by changing a digit.

685318 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171328 + ... + 171331.

It is an arithmetic number, because the mean of its divisors is an integer number (256995).

2⁶⁸⁵³¹⁸ is an apocalyptic number.

685318 is a deficient number, since it is larger than the sum of its proper divisors (342662).

685318 is a wasteful number, since it uses less digits than its factorization.

685318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342661.

The product of its digits is 5760, while the sum is 31.

The square root of 685318 is about 827.8393563971. The cubic root of 685318 is about 88.1652370618.

The spelling of 685318 in words is "six hundred eighty-five thousand, three hundred eighteen".