129398028 has 24 divisors (see below), whose sum is σ = 310090032. Its totient is φ = 41966784.

The previous prime is 129398011. The next prime is 129398041. The reversal of 129398028 is 820893921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145275 + ... + 146162.

It is an arithmetic number, because the mean of its divisors is an integer number (12920418).

Almost surely, 2^129398028 is an apocalyptic number.

It is an amenable number.

129398028 is an abundant number, since it is smaller than the sum of its proper divisors (180692004).

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

129398028 is a wasteful number, since it uses less digits than its factorization.

129398028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291481 (or 291479 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 129398028 is about 11375.3254019391. The cubic root of 129398028 is about 505.7965770337.

The spelling of 129398028 in words is "one hundred twenty-nine million, three hundred ninety-eight thousand, twenty-eight".