138779431754 has 8 divisors (see below), whose sum is σ = 208171231680. Its totient is φ = 69389021196.

The previous prime is 138779431741. The next prime is 138779431759. The reversal of 138779431754 is 457134977831.

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

It is a junction number, because it is equal to n+sod(n) for n = 138779431693 and 138779431702.

It is not an unprimeable number, because it can be changed into a prime (138779431759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44984 + ... + 528755.

It is an arithmetic number, because the mean of its divisors is an integer number (26021403960).

Almost surely, 2^138779431754 is an apocalyptic number.

138779431754 is a deficient number, since it is larger than the sum of its proper divisors (69391799926).

138779431754 is a wasteful number, since it uses less digits than its factorization.

138779431754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694684.

The product of its digits is 17781120, while the sum is 59.

The spelling of 138779431754 in words is "one hundred thirty-eight billion, seven hundred seventy-nine million, four hundred thirty-one thousand, seven hundred fifty-four".