129525380 has 24 divisors (see below), whose sum is σ = 288004248. Its totient is φ = 48762368.

The previous prime is 129525379. The next prime is 129525391. The reversal of 129525380 is 83525921.

It can be written as a sum of positive squares in 4 ways, for example, as 5692996 + 123832384 = 2386^2 + 11128^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129525380.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190139 + ... + 190818.

It is an arithmetic number, because the mean of its divisors is an integer number (12000177).

Almost surely, 2^129525380 is an apocalyptic number.

129525380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129525380 is an abundant number, since it is smaller than the sum of its proper divisors (158478868).

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

129525380 is a wasteful number, since it uses less digits than its factorization.

129525380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380983 (or 380981 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 129525380 is about 11380.9217552885. The cubic root of 129525380 is about 505.9624556186.

The spelling of 129525380 in words is "one hundred twenty-nine million, five hundred twenty-five thousand, three hundred eighty".