129900138 has 16 divisors (see below), whose sum is σ = 264702816. Its totient is φ = 42482960.

The previous prime is 129900107. The next prime is 129900139. The reversal of 129900138 is 831009921.

It is a junction number, because it is equal to n+sod(n) for n = 129900099 and 129900108.

It is not an unprimeable number, because it can be changed into a prime (129900139) 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 7 ways as a sum of consecutive naturals, for example, 203928 + ... + 204563.

It is an arithmetic number, because the mean of its divisors is an integer number (16543926).

Almost surely, 2^129900138 is an apocalyptic number.

129900138 is an abundant number, since it is smaller than the sum of its proper divisors (134802678).

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

129900138 is a wasteful number, since it uses less digits than its factorization.

129900138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408549.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 129900138 is about 11397.3741712730. The cubic root of 129900138 is about 506.4499557021.

The spelling of 129900138 in words is "one hundred twenty-nine million, nine hundred thousand, one hundred thirty-eight".