685995 has 32 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 330624.

The previous prime is 685991. The next prime is 686003. The reversal of 685995 is 599586.

It is not a de Polignac number, because 685995 - 2² = 685991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685991) 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 31 ways as a sum of consecutive naturals, for example, 8224 + ... + 8306.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶⁸⁵⁹⁹⁵ is an apocalyptic number.

685995 is a deficient number, since it is larger than the sum of its proper divisors (523605).

685995 is a wasteful number, since it uses less digits than its factorization.

685995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139.

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

The square root of 685995 is about 828.2481512204. The cubic root of 685995 is about 88.1942592198.

The spelling of 685995 in words is "six hundred eighty-five thousand, nine hundred ninety-five".