129870520 has 64 divisors (see below), whose sum is σ = 317157120. Its totient is φ = 47576064.

The previous prime is 129870473. The next prime is 129870523. The reversal of 129870520 is 25078921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129870523) 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 15 ways as a sum of consecutive naturals, for example, 70329 + ... + 72151.

It is an arithmetic number, because the mean of its divisors is an integer number (4955580).

Almost surely, 2^129870520 is an apocalyptic number.

129870520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129870520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158578560).

129870520 is an abundant number, since it is smaller than the sum of its proper divisors (187286600).

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

129870520 is a wasteful number, since it uses less digits than its factorization.

129870520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984 (or 1980 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 129870520 is about 11396.0747628295. The cubic root of 129870520 is about 506.4114615809.

The spelling of 129870520 in words is "one hundred twenty-nine million, eight hundred seventy thousand, five hundred twenty".