685879 has 8 divisors (see below), whose sum is σ = 722160. Its totient is φ = 650496.

The previous prime is 685859. The next prime is 685907. The reversal of 685879 is 978586.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685879 - 2⁹ = 685367 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1767 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (90270).

2⁶⁸⁵⁸⁷⁹ is an apocalyptic number.

685879 is a deficient number, since it is larger than the sum of its proper divisors (36281).

685879 is a wasteful number, since it uses less digits than its factorization.

685879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its digits is 120960, while the sum is 43.

The square root of 685879 is about 828.1781209378. The cubic root of 685879 is about 88.1892877984.

The spelling of 685879 in words is "six hundred eighty-five thousand, eight hundred seventy-nine".