129871018 has 8 divisors (see below), whose sum is σ = 203276448. Its totient is φ = 62112204.

The previous prime is 129870971. The next prime is 129871031. The reversal of 129871018 is 810178921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1411596 + ... + 1411687.

It is an arithmetic number, because the mean of its divisors is an integer number (25409556).

Almost surely, 2^129871018 is an apocalyptic number.

129871018 is a deficient number, since it is larger than the sum of its proper divisors (73405430).

129871018 is a wasteful number, since it uses less digits than its factorization.

129871018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823308.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 129871018 is about 11396.0966124371. The cubic root of 129871018 is about 506.4121088733.

The spelling of 129871018 in words is "one hundred twenty-nine million, eight hundred seventy-one thousand, eighteen".