685747 has 2 divisors, whose sum is σ = 685748. Its totient is φ = 685746.

The previous prime is 685739. The next prime is 685753. The reversal of 685747 is 747586.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685747 - 2³ = 685739 is a prime.

It is not a weakly prime, because it can be changed into another prime (685717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342873 + 342874.

It is an arithmetic number, because the mean of its divisors is an integer number (342874).

2⁶⁸⁵⁷⁴⁷ is an apocalyptic number.

685747 is a deficient number, since it is larger than the sum of its proper divisors (1).

685747 is an equidigital number, since it uses as much as digits as its factorization.

685747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 37.

The square root of 685747 is about 828.0984241019. The cubic root of 685747 is about 88.1836299817.

The spelling of 685747 in words is "six hundred eighty-five thousand, seven hundred forty-seven".