85384639 has 2 divisors, whose sum is σ = 85384640. Its totient is φ = 85384638.

The previous prime is 85384619. The next prime is 85384657. The reversal of 85384639 is 93648358.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85384639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85384619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42692319 + 42692320.

It is an arithmetic number, because the mean of its divisors is an integer number (42692320).

Almost surely, 2^85384639 is an apocalyptic number.

85384639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85384639 is an equidigital number, since it uses as much as digits as its factorization.

85384639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 85384639 is about 9240.3808904179. The cubic root of 85384639 is about 440.3451819561.

The spelling of 85384639 in words is "eighty-five million, three hundred eighty-four thousand, six hundred thirty-nine".