129939138 has 48 divisors (see below), whose sum is σ = 338694720. Its totient is φ = 35170848.

The previous prime is 129939137. The next prime is 129939151. The reversal of 129939138 is 831939921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129939093 and 129939102.

It is not an unprimeable number, because it can be changed into a prime (129939137) 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 23 ways as a sum of consecutive naturals, for example, 24745 + ... + 29532.

It is an arithmetic number, because the mean of its divisors is an integer number (7056140).

Almost surely, 2^129939138 is an apocalyptic number.

129939138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129939138 is an abundant number, since it is smaller than the sum of its proper divisors (208755582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129939138 is a wasteful number, since it uses less digits than its factorization.

129939138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54311 (or 54308 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 129939138 is about 11399.0849632767. The cubic root of 129939138 is about 506.5006345600.

The spelling of 129939138 in words is "one hundred twenty-nine million, nine hundred thirty-nine thousand, one hundred thirty-eight".