685957 has 8 divisors (see below), whose sum is σ = 732800. Its totient is φ = 640224.

The previous prime is 685939. The next prime is 685963. The reversal of 685957 is 759586.

It is a happy number.

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

It is not a de Polignac number, because 685957 - 2¹¹ = 683909 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 (685907) 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 in 7 ways as a sum of consecutive naturals, for example, 1273 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (91600).

2⁶⁸⁵⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

685957 is a deficient number, since it is larger than the sum of its proper divisors (46843).

685957 is a wasteful number, since it uses less digits than its factorization.

685957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555.

The product of its digits is 75600, while the sum is 40.

The square root of 685957 is about 828.2252109179. The cubic root of 685957 is about 88.1926307125.

The spelling of 685957 in words is "six hundred eighty-five thousand, nine hundred fifty-seven".