138391444947 has 12 divisors (see below), whose sum is σ = 214647955656. Its totient is φ = 79080825600.

The previous prime is 138391444913. The next prime is 138391444973. The reversal of 138391444947 is 749444193831.

138391444947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138391444947 - 2⁷ = 138391444819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138391444447) 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 11 ways as a sum of consecutive naturals, for example, 470719054 + ... + 470719347.

It is an arithmetic number, because the mean of its divisors is an integer number (17887329638).

Almost surely, 2^138391444947 is an apocalyptic number.

138391444947 is a deficient number, since it is larger than the sum of its proper divisors (76256510709).

138391444947 is an equidigital number, since it uses as much as digits as its factorization.

138391444947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941438418 (or 941438411 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 57.

The spelling of 138391444947 in words is "one hundred thirty-eight billion, three hundred ninety-one million, four hundred forty-four thousand, nine hundred forty-seven".