138901387639 has 4 divisors (see below), whose sum is σ = 158744443024. Its totient is φ = 119058332256.

The previous prime is 138901387619. The next prime is 138901387657. The reversal of 138901387639 is 936783109831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936783109831 = 43 ⋅21785653717.

It is a cyclic number.

It is not a de Polignac number, because 138901387639 - 2⁷ = 138901387511 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 (138901387619) 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, 9921527682 + ... + 9921527695.

It is an arithmetic number, because the mean of its divisors is an integer number (39686110756).

Almost surely, 2^138901387639 is an apocalyptic number.

138901387639 is a deficient number, since it is larger than the sum of its proper divisors (19843055385).

138901387639 is an equidigital number, since it uses as much as digits as its factorization.

138901387639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19843055384.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 138901387639 in words is "one hundred thirty-eight billion, nine hundred one million, three hundred eighty-seven thousand, six hundred thirty-nine".