685975 has 12 divisors (see below), whose sum is σ = 888336. Its totient is φ = 524480.

The previous prime is 685973. The next prime is 685987. The reversal of 685975 is 579586.

It is a happy number.

It is not a de Polignac number, because 685975 - 2¹ = 685973 is a prime.

It is a Duffinian number.

685975 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685973) 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 11 ways as a sum of consecutive naturals, for example, 22 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (74028).

2⁶⁸⁵⁹⁷⁵ is an apocalyptic number.

685975 is a deficient number, since it is larger than the sum of its proper divisors (202361).

685975 is a wasteful number, since it uses less digits than its factorization.

685975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226 (or 1221 counting only the distinct ones).

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

The square root of 685975 is about 828.2360774562. The cubic root of 685975 is about 88.1934021182.

The spelling of 685975 in words is "six hundred eighty-five thousand, nine hundred seventy-five".