85838939 has 2 divisors, whose sum is σ = 85838940. Its totient is φ = 85838938.

The previous prime is 85838911. The next prime is 85838947. The reversal of 85838939 is 93983858.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85838939 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (85838989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42919469 + 42919470.

It is an arithmetic number, because the mean of its divisors is an integer number (42919470).

Almost surely, 2^85838939 is an apocalyptic number.

85838939 is a deficient number, since it is larger than the sum of its proper divisors (1).

85838939 is an equidigital number, since it uses as much as digits as its factorization.

85838939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The square root of 85838939 is about 9264.9305987687. The cubic root of 85838939 is about 441.1247720883.

The spelling of 85838939 in words is "eighty-five million, eight hundred thirty-eight thousand, nine hundred thirty-nine".