685375 has 8 divisors (see below), whose sum is σ = 855504. Its totient is φ = 548200.

The previous prime is 685369. The next prime is 685381. The reversal of 685375 is 573586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (685369) and next prime (685381).

It is not a de Polignac number, because 685375 - 2³ = 685367 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685375.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2617 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (106938).

2⁶⁸⁵³⁷⁵ is an apocalyptic number.

685375 is a deficient number, since it is larger than the sum of its proper divisors (170129).

685375 is an equidigital number, since it uses as much as digits as its factorization.

685375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5498 (or 5488 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 685375 is about 827.8737826505. The cubic root of 685375 is about 88.1676813185.

The spelling of 685375 in words is "six hundred eighty-five thousand, three hundred seventy-five".