685718 has 16 divisors (see below), whose sum is σ = 1140480. Its totient is φ = 306600.

The previous prime is 685717. The next prime is 685723. The reversal of 685718 is 817586.

It is a happy number.

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 685718.

It is not an unprimeable number, because it can be changed into a prime (685717) 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 7 ways as a sum of consecutive naturals, for example, 1343 + ... + 1781.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2⁶⁸⁵⁷¹⁸ is an apocalyptic number.

685718 is a deficient number, since it is larger than the sum of its proper divisors (454762).

685718 is a wasteful number, since it uses less digits than its factorization.

685718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523.

The product of its digits is 13440, while the sum is 35.

The square root of 685718 is about 828.0809139209. The cubic root of 685718 is about 88.1823868793.

The spelling of 685718 in words is "six hundred eighty-five thousand, seven hundred eighteen".