129918572 has 24 divisors (see below), whose sum is σ = 262972416. Its totient is φ = 55007568.

The previous prime is 129918557. The next prime is 129918577. The reversal of 129918572 is 275819921.

It is a happy number.

129918572 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (129918577) 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, 25628 + ... + 30275.

It is an arithmetic number, because the mean of its divisors is an integer number (10957184).

Almost surely, 2^129918572 is an apocalyptic number.

It is an amenable number.

129918572 is an abundant number, since it is smaller than the sum of its proper divisors (133053844).

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

129918572 is a wasteful number, since it uses less digits than its factorization.

129918572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55997 (or 55995 counting only the distinct ones).

The product of its digits is 90720, while the sum is 44.

The square root of 129918572 is about 11398.1828376281. The cubic root of 129918572 is about 506.4739111729.

The spelling of 129918572 in words is "one hundred twenty-nine million, nine hundred eighteen thousand, five hundred seventy-two".