685339 has 2 divisors, whose sum is σ = 685340. Its totient is φ = 685338.

The previous prime is 685337. The next prime is 685361. The reversal of 685339 is 933586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685339 - 2¹ = 685337 is a prime.

Together with 685337, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (685337) 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 as a sum of consecutive naturals, namely, 342669 + 342670.

It is an arithmetic number, because the mean of its divisors is an integer number (342670).

2⁶⁸⁵³³⁹ is an apocalyptic number.

685339 is a deficient number, since it is larger than the sum of its proper divisors (1).

685339 is an equidigital number, since it uses as much as digits as its factorization.

685339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 685339 is about 827.8520399202. The cubic root of 685339 is about 88.1661375932.

It can be divided in two parts, 685 and 339, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 685339 in words is "six hundred eighty-five thousand, three hundred thirty-nine".