685345 has 8 divisors (see below), whose sum is σ = 830376. Its totient is φ = 542976.

The previous prime is 685339. The next prime is 685361. The reversal of 685345 is 543586.

It can be written as a sum of positive squares in 4 ways, for example, as 58081 + 627264 = 241^2 + 792^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 685345 - 2³ = 685337 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (103797).

2⁶⁸⁵³⁴⁵ is an apocalyptic number.

It is an amenable number.

685345 is a deficient number, since it is larger than the sum of its proper divisors (145031).

685345 is a wasteful number, since it uses less digits than its factorization.

685345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its digits is 14400, while the sum is 31.

The square root of 685345 is about 827.8556637482. The cubic root of 685345 is about 88.1663948845.

The spelling of 685345 in words is "six hundred eighty-five thousand, three hundred forty-five".