685185 has 16 divisors (see below), whose sum is σ = 1161216. Its totient is φ = 343808.

The previous prime is 685177. The next prime is 685199. The reversal of 685185 is 581586.

It is not a de Polignac number, because 685185 - 2³ = 685177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1089 + ... + 1598.

It is an arithmetic number, because the mean of its divisors is an integer number (72576).

2⁶⁸⁵¹⁸⁵ is an apocalyptic number.

It is an amenable number.

685185 is a deficient number, since it is larger than the sum of its proper divisors (476031).

685185 is a wasteful number, since it uses less digits than its factorization.

685185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712.

The product of its digits is 9600, while the sum is 33.

The square root of 685185 is about 827.7590229046. The cubic root of 685185 is about 88.1595332693.

It can be divided in two parts, 68 and 5185, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 685185 in words is "six hundred eighty-five thousand, one hundred eighty-five".