129928347 has 16 divisors (see below), whose sum is σ = 198696960. Its totient is φ = 83824200.

The previous prime is 129928339. The next prime is 129928369. The reversal of 129928347 is 743829921.

It is not a de Polignac number, because 129928347 - 2³ = 129928339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129928307) 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, 76779 + ... + 78452.

It is an arithmetic number, because the mean of its divisors is an integer number (12418560).

Almost surely, 2^129928347 is an apocalyptic number.

129928347 is a deficient number, since it is larger than the sum of its proper divisors (68768613).

129928347 is a wasteful number, since it uses less digits than its factorization.

129928347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155271 (or 155265 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 129928347 is about 11398.6116259832. The cubic root of 129928347 is about 506.4866131247.

It can be divided in two parts, 1299 and 28347, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 129928347 in words is "one hundred twenty-nine million, nine hundred twenty-eight thousand, three hundred forty-seven".