138724634879 has 8 divisors (see below), whose sum is σ = 139158093312. Its totient is φ = 138291548320.

The previous prime is 138724634843. The next prime is 138724634891. The reversal of 138724634879 is 978436427831.

138724634879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138724634879 - 2²⁴ = 138707857663 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 (138724634179) 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 7 ways as a sum of consecutive naturals, for example, 663869 + ... + 847449.

It is an arithmetic number, because the mean of its divisors is an integer number (17394761664).

Almost surely, 2^138724634879 is an apocalyptic number.

138724634879 is a deficient number, since it is larger than the sum of its proper divisors (433458433).

138724634879 is a wasteful number, since it uses less digits than its factorization.

138724634879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185937.

The product of its digits is 48771072, while the sum is 62.

The spelling of 138724634879 in words is "one hundred thirty-eight billion, seven hundred twenty-four million, six hundred thirty-four thousand, eight hundred seventy-nine".