685559 has 12 divisors (see below), whose sum is σ = 845424. Its totient is φ = 552384.

The previous prime is 685547. The next prime is 685591. The reversal of 685559 is 955586.

It is a de Polignac number, because none of the positive numbers 2^k-685559 is a prime.

It is a super-2 number, since 2×685559² = 939982284962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685519) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422 + ... + 1244.

It is an arithmetic number, because the mean of its divisors is an integer number (70452).

2⁶⁸⁵⁵⁵⁹ is an apocalyptic number.

685559 is a deficient number, since it is larger than the sum of its proper divisors (159865).

685559 is a wasteful number, since it uses less digits than its factorization.

685559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 847 counting only the distinct ones).

The product of its digits is 54000, while the sum is 38.

The square root of 685559 is about 827.9849032440. The cubic root of 685559 is about 88.1755706257.

The spelling of 685559 in words is "six hundred eighty-five thousand, five hundred fifty-nine".