129836375438 has 32 divisors (see below), whose sum is σ = 243171866880. Its totient is φ = 50510396160.

The previous prime is 129836375407. The next prime is 129836375443. The reversal of 129836375438 is 834573638921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522728 + ... + 730011.

It is an arithmetic number, because the mean of its divisors is an integer number (7599120840).

Almost surely, 2^129836375438 is an apocalyptic number.

129836375438 is a deficient number, since it is larger than the sum of its proper divisors (113335491442).

129836375438 is a wasteful number, since it uses less digits than its factorization.

129836375438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253432.

The product of its digits is 26127360, while the sum is 59.

The spelling of 129836375438 in words is "one hundred twenty-nine billion, eight hundred thirty-six million, three hundred seventy-five thousand, four hundred thirty-eight".