685859 has 2 divisors, whose sum is σ = 685860. Its totient is φ = 685858.

The previous prime is 685849. The next prime is 685907. The reversal of 685859 is 958586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685859 - 2¹² = 681763 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6³ + 8⁵ + 8⁶ + 5² + 5⁸ + 9² .

It is not a weakly prime, because it can be changed into another prime (685819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342929 + 342930.

It is an arithmetic number, because the mean of its divisors is an integer number (342930).

2⁶⁸⁵⁸⁵⁹ is an apocalyptic number.

685859 is a deficient number, since it is larger than the sum of its proper divisors (1).

685859 is an equidigital number, since it uses as much as digits as its factorization.

685859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 685859 is about 828.1660461526. The cubic root of 685859 is about 88.1884306001.

The spelling of 685859 in words is "six hundred eighty-five thousand, eight hundred fifty-nine".