123886138739 has 4 divisors (see below), whose sum is σ = 135148515000. Its totient is φ = 112623762480.

The previous prime is 123886138697. The next prime is 123886138741. The reversal of 123886138739 is 937831688321.

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: 937831688321 = 11 ⋅85257426211.

It is a cyclic number.

It is not a de Polignac number, because 123886138739 - 2¹² = 123886134643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123886128739) 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, 5631188114 + ... + 5631188135.

It is an arithmetic number, because the mean of its divisors is an integer number (33787128750).

Almost surely, 2^123886138739 is an apocalyptic number.

123886138739 is a deficient number, since it is larger than the sum of its proper divisors (11262376261).

123886138739 is a wasteful number, since it uses less digits than its factorization.

123886138739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11262376260.

The product of its digits is 10450944, while the sum is 59.

The spelling of 123886138739 in words is "one hundred twenty-three billion, eight hundred eighty-six million, one hundred thirty-eight thousand, seven hundred thirty-nine".