685485 has 12 divisors (see below), whose sum is σ = 1188252. Its totient is φ = 365568.

The previous prime is 685471. The next prime is 685493. The reversal of 685485 is 584586.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 171396 + 514089 = 414^2 + 717^2 .

It is not a de Polignac number, because 685485 - 2⁵ = 685453 is a prime.

685485 is a lucky number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7572 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (99021).

2⁶⁸⁵⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

685485 is a deficient number, since it is larger than the sum of its proper divisors (502767).

685485 is a wasteful number, since it uses less digits than its factorization.

685485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15244 (or 15241 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 685485 is about 827.9402152330. The cubic root of 685485 is about 88.1723979219.

It can be divided in two parts, 6 and 85485, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 685485 in words is "six hundred eighty-five thousand, four hundred eighty-five".