85805939 has 4 divisors (see below), whose sum is σ = 89536656. Its totient is φ = 82075224.

The previous prime is 85805933. The next prime is 85805947. The reversal of 85805939 is 93950858.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-85805939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85805893 and 85805902.

It is not an unprimeable number, because it can be changed into a prime (85805933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1865324 + ... + 1865369.

It is an arithmetic number, because the mean of its divisors is an integer number (22384164).

Almost surely, 2^85805939 is an apocalyptic number.

85805939 is a deficient number, since it is larger than the sum of its proper divisors (3730717).

85805939 is a wasteful number, since it uses less digits than its factorization.

85805939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730716.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 85805939 is about 9263.1495183874. The cubic root of 85805939 is about 441.0682360395.

The spelling of 85805939 in words is "eighty-five million, eight hundred five thousand, nine hundred thirty-nine".