685812 has 24 divisors (see below), whose sum is σ = 1626016. Its totient is φ = 224928.

The previous prime is 685793. The next prime is 685819. The reversal of 685812 is 218586.

It is an Ulam number.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 685812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685819) by changing a digit.

685812 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 in 7 ways as a sum of consecutive naturals, for example, 378 + ... + 1230.

2⁶⁸⁵⁸¹² is an apocalyptic number.

It is an amenable number.

685812 is an abundant number, since it is smaller than the sum of its proper divisors (940204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685812 is a wasteful number, since it uses less digits than its factorization.

685812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 925 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 685812 is about 828.1376697144. The cubic root of 685812 is about 88.1864161185.

The spelling of 685812 in words is "six hundred eighty-five thousand, eight hundred twelve".