685475 has 12 divisors (see below), whose sum is σ = 971664. Its totient is φ = 469920.

The previous prime is 685471. The next prime is 685493. The reversal of 685475 is 574586.

It is not a de Polignac number, because 685475 - 2² = 685471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685475.

It is not an unprimeable number, because it can be changed into a prime (685471) 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 11 ways as a sum of consecutive naturals, for example, 1784 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (80972).

2⁶⁸⁵⁴⁷⁵ is an apocalyptic number.

685475 is a deficient number, since it is larger than the sum of its proper divisors (286189).

685475 is a wasteful number, since it uses less digits than its factorization.

685475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934 (or 3929 counting only the distinct ones).

The product of its digits is 33600, while the sum is 35.

The square root of 685475 is about 827.9341761275. The cubic root of 685475 is about 88.1719691606.

Subtracting from 685475 its reverse (574586), we obtain a square (110889 = 333²).

The spelling of 685475 in words is "six hundred eighty-five thousand, four hundred seventy-five".