138023517989 has 4 divisors (see below), whose sum is σ = 157741163424. Its totient is φ = 118305872556.

The previous prime is 138023517967. The next prime is 138023518021. The reversal of 138023517989 is 989715320831.

138023517989 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138023517989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138023517889) 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, 9858822707 + ... + 9858822720.

It is an arithmetic number, because the mean of its divisors is an integer number (39435290856).

Almost surely, 2^138023517989 is an apocalyptic number.

It is an amenable number.

138023517989 is a deficient number, since it is larger than the sum of its proper divisors (19717645435).

138023517989 is an equidigital number, since it uses as much as digits as its factorization.

138023517989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19717645434.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 138023517989 in words is "one hundred thirty-eight billion, twenty-three million, five hundred seventeen thousand, nine hundred eighty-nine".