85864939 has 2 divisors, whose sum is σ = 85864940. Its totient is φ = 85864938.

The previous prime is 85864931. The next prime is 85864949. The reversal of 85864939 is 93946858.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85864939 - 2³ = 85864931 is a prime.

It is not a weakly prime, because it can be changed into another prime (85864931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42932469 + 42932470.

It is an arithmetic number, because the mean of its divisors is an integer number (42932470).

Almost surely, 2^85864939 is an apocalyptic number.

85864939 is a deficient number, since it is larger than the sum of its proper divisors (1).

85864939 is an equidigital number, since it uses as much as digits as its factorization.

85864939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The square root of 85864939 is about 9266.3336331043. Note that the first 3 decimals coincide. The cubic root of 85864939 is about 441.1693054373.

The spelling of 85864939 in words is "eighty-five million, eight hundred sixty-four thousand, nine hundred thirty-nine".