685039 has 2 divisors, whose sum is σ = 685040. Its totient is φ = 685038.

The previous prime is 685031. The next prime is 685051. The reversal of 685039 is 930586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685039 - 2³ = 685031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342519 + 342520.

It is an arithmetic number, because the mean of its divisors is an integer number (342520).

2⁶⁸⁵⁰³⁹ is an apocalyptic number.

685039 is a deficient number, since it is larger than the sum of its proper divisors (1).

685039 is an equidigital number, since it uses as much as digits as its factorization.

685039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 685039 is about 827.6708282886. The cubic root of 685039 is about 88.1532711132.

It can be divided in two parts, 6850 and 39, that added together give a square (6889 = 83²).

The spelling of 685039 in words is "six hundred eighty-five thousand, thirty-nine".