85838639 has 2 divisors, whose sum is σ = 85838640. Its totient is φ = 85838638.

The previous prime is 85838617. The next prime is 85838653. The reversal of 85838639 is 93683858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85838639 - 2⁸ = 85838383 is a prime.

It is a super-3 number, since 3×85838639³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85838609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42919319 + 42919320.

It is an arithmetic number, because the mean of its divisors is an integer number (42919320).

Almost surely, 2^85838639 is an apocalyptic number.

85838639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85838639 is an equidigital number, since it uses as much as digits as its factorization.

85838639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The square root of 85838639 is about 9264.9144086710. The cubic root of 85838639 is about 441.1242581895.

The spelling of 85838639 in words is "eighty-five million, eight hundred thirty-eight thousand, six hundred thirty-nine".