138669727739 has 4 divisors (see below), whose sum is σ = 138805546320. Its totient is φ = 138533909160.

The previous prime is 138669727681. The next prime is 138669727751. The reversal of 138669727739 is 937727966831.

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-138669727739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138669727439) 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, 67907759 + ... + 67909800.

It is an arithmetic number, because the mean of its divisors is an integer number (34701386580).

Almost surely, 2^138669727739 is an apocalyptic number.

138669727739 is a deficient number, since it is larger than the sum of its proper divisors (135818581).

138669727739 is a wasteful number, since it uses less digits than its factorization.

138669727739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135818580.

The product of its digits is 144027072, while the sum is 68.

The spelling of 138669727739 in words is "one hundred thirty-eight billion, six hundred sixty-nine million, seven hundred twenty-seven thousand, seven hundred thirty-nine".