129138570 has 64 divisors (see below), whose sum is σ = 375684480. Its totient is φ = 31305600.

The previous prime is 129138557. The next prime is 129138577. The reversal of 129138570 is 75831921.

It is not an unprimeable number, because it can be changed into a prime (129138577) 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 31 ways as a sum of consecutive naturals, for example, 18771 + ... + 24710.

It is an arithmetic number, because the mean of its divisors is an integer number (5870070).

Almost surely, 2^129138570 is an apocalyptic number.

129138570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129138570 is an abundant number, since it is smaller than the sum of its proper divisors (246545910).

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

129138570 is a wasteful number, since it uses less digits than its factorization.

129138570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43508 (or 43502 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 129138570 is about 11363.9152583958. The cubic root of 129138570 is about 505.4582906353.

The spelling of 129138570 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, five hundred seventy".