86139805 has 4 divisors (see below), whose sum is σ = 103367772. Its totient is φ = 68911840.

The previous prime is 86139751. The next prime is 86139821. The reversal of 86139805 is 50893168.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64850809 + 21288996 = 8053^2 + 4614^2 .

It is not a de Polignac number, because 86139805 - 2¹¹ = 86137757 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8613976 + ... + 8613985.

It is an arithmetic number, because the mean of its divisors is an integer number (25841943).

Almost surely, 2^86139805 is an apocalyptic number.

It is an amenable number.

86139805 is a deficient number, since it is larger than the sum of its proper divisors (17227967).

86139805 is a wasteful number, since it uses less digits than its factorization.

86139805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17227966.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 86139805 is about 9281.1532149836. The cubic root of 86139805 is about 441.6395527835.

The spelling of 86139805 in words is "eighty-six million, one hundred thirty-nine thousand, eight hundred five".