85877839 has 2 divisors, whose sum is σ = 85877840. Its totient is φ = 85877838.

The previous prime is 85877833. The next prime is 85877867. The reversal of 85877839 is 93877858.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85877839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85877839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85877833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42938919 + 42938920.

It is an arithmetic number, because the mean of its divisors is an integer number (42938920).

Almost surely, 2^85877839 is an apocalyptic number.

85877839 is a deficient number, since it is larger than the sum of its proper divisors (1).

85877839 is an equidigital number, since it uses as much as digits as its factorization.

85877839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 55.

The square root of 85877839 is about 9267.0296751440. The cubic root of 85877839 is about 441.1913974930.

The spelling of 85877839 in words is "eighty-five million, eight hundred seventy-seven thousand, eight hundred thirty-nine".