129428874 has 64 divisors (see below), whose sum is σ = 306000000. Its totient is φ = 40435200.

The previous prime is 129428863. The next prime is 129428899. The reversal of 129428874 is 478824921.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 103002 + ... + 104250.

It is an arithmetic number, because the mean of its divisors is an integer number (4781250).

Almost surely, 2^129428874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129428874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153000000).

129428874 is an abundant number, since it is smaller than the sum of its proper divisors (176571126).

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

129428874 is a wasteful number, since it uses less digits than its factorization.

129428874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380 (or 1374 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 129428874 is about 11376.6811504938. The cubic root of 129428874 is about 505.8367645644.

The spelling of 129428874 in words is "one hundred twenty-nine million, four hundred twenty-eight thousand, eight hundred seventy-four".