685723 has 2 divisors, whose sum is σ = 685724. Its totient is φ = 685722.

The previous prime is 685717. The next prime is 685733. The reversal of 685723 is 327586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685723 - 2¹³ = 677531 is a prime.

It is equal to p₅₅₄₈₉ and since 685723 and 55489 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (685733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342861 + 342862.

It is an arithmetic number, because the mean of its divisors is an integer number (342862).

2⁶⁸⁵⁷²³ is an apocalyptic number.

685723 is a deficient number, since it is larger than the sum of its proper divisors (1).

685723 is an equidigital number, since it uses as much as digits as its factorization.

685723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 685723 is about 828.0839329440. The cubic root of 685723 is about 88.1826012098.

The spelling of 685723 in words is "six hundred eighty-five thousand, seven hundred twenty-three".