685830 has 16 divisors (see below), whose sum is σ = 1646064. Its totient is φ = 182880.

The previous prime is 685819. The next prime is 685849. The reversal of 685830 is 38586.

685830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 22861 = 685830 / (6 + 8 + 5 + 8 + 3 + 0).

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

685830 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, 11401 + ... + 11460.

It is an arithmetic number, because the mean of its divisors is an integer number (102879).

2⁶⁸⁵⁸³⁰ is an apocalyptic number.

685830 is an abundant number, since it is smaller than the sum of its proper divisors (960234).

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

685830 is a wasteful number, since it uses less digits than its factorization.

685830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22871.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 685830 is about 828.1485374014. The cubic root of 685830 is about 88.1871876330.

The spelling of 685830 in words is "six hundred eighty-five thousand, eight hundred thirty".