985639 has 2 divisors, whose sum is σ = 985640. Its totient is φ = 985638.

The previous prime is 985631. The next prime is 985657. The reversal of 985639 is 936589.

985639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 985639 - 2³ = 985631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492819 + 492820.

It is an arithmetic number, because the mean of its divisors is an integer number (492820).

2⁹⁸⁵⁶³⁹ is an apocalyptic number.

985639 is a deficient number, since it is larger than the sum of its proper divisors (1).

985639 is an equidigital number, since it uses as much as digits as its factorization.

985639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 985639 is about 992.7935334197. The cubic root of 985639 is about 99.5189900036.

The spelling of 985639 in words is "nine hundred eighty-five thousand, six hundred thirty-nine".