685965 has 32 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 304704.

The previous prime is 685963. The next prime is 685969. The reversal of 685965 is 569586.

It is not a de Polignac number, because 685965 - 2¹ = 685963 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4866 + ... + 5004.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2⁶⁸⁵⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

685965 is a deficient number, since it is larger than the sum of its proper divisors (604275).

685965 is a wasteful number, since it uses less digits than its factorization.

685965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201.

The product of its digits is 64800, while the sum is 39.

The square root of 685965 is about 828.2300405081. The cubic root of 685965 is about 88.1929735611.

The spelling of 685965 in words is "six hundred eighty-five thousand, nine hundred sixty-five".