138805288939 has 4 divisors (see below), whose sum is σ = 139803888280. Its totient is φ = 137806689600.

The previous prime is 138805288901. The next prime is 138805288961. The reversal of 138805288939 is 939882508831.

138805288939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138805288939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138805288969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499299462 + ... + 499299739.

It is an arithmetic number, because the mean of its divisors is an integer number (34950972070).

Almost surely, 2^138805288939 is an apocalyptic number.

138805288939 is a deficient number, since it is larger than the sum of its proper divisors (998599341).

138805288939 is an equidigital number, since it uses as much as digits as its factorization.

138805288939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998599340.

The product of its (nonzero) digits is 29859840, while the sum is 64.

The spelling of 138805288939 in words is "one hundred thirty-eight billion, eight hundred five million, two hundred eighty-eight thousand, nine hundred thirty-nine".