685857 has 4 divisors (see below), whose sum is σ = 914480. Its totient is φ = 457236.

The previous prime is 685849. The next prime is 685859. The reversal of 685857 is 758586.

It is a happy number.

685857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 685857 - 2³ = 685849 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (685859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114307 + ... + 114312.

It is an arithmetic number, because the mean of its divisors is an integer number (228620).

2⁶⁸⁵⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

685857 is a deficient number, since it is larger than the sum of its proper divisors (228623).

685857 is a wasteful number, since it uses less digits than its factorization.

685857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228622.

The product of its digits is 67200, while the sum is 39.

The square root of 685857 is about 828.1648386644. The cubic root of 685857 is about 88.1883448794.

The spelling of 685857 in words is "six hundred eighty-five thousand, eight hundred fifty-seven".