685959 has 8 divisors (see below), whose sum is σ = 921840. Its totient is φ = 453696.

The previous prime is 685939. The next prime is 685963. The reversal of 685959 is 959586.

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

It is not a de Polignac number, because 685959 - 2¹¹ = 683911 is a prime.

685959 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 685959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (115230).

2⁶⁸⁵⁹⁵⁹ is an apocalyptic number.

685959 is a deficient number, since it is larger than the sum of its proper divisors (235881).

685959 is a wasteful number, since it uses less digits than its factorization.

685959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809.

The product of its digits is 97200, while the sum is 42.

The square root of 685959 is about 828.2264183181. The cubic root of 685959 is about 88.1927164249.

The spelling of 685959 in words is "six hundred eighty-five thousand, nine hundred fifty-nine".