129928126 has 8 divisors (see below), whose sum is σ = 194947200. Its totient is φ = 64945728.

The previous prime is 129928121. The next prime is 129928133. The reversal of 129928126 is 621829921.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129928121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2830 + ... + 16366.

It is an arithmetic number, because the mean of its divisors is an integer number (24368400).

Almost surely, 2^129928126 is an apocalyptic number.

129928126 is a deficient number, since it is larger than the sum of its proper divisors (65019074).

129928126 is a wasteful number, since it uses less digits than its factorization.

129928126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18338.

The product of its digits is 31104, while the sum is 40.

The square root of 129928126 is about 11398.6019318160. The cubic root of 129928126 is about 506.4863259572.

The spelling of 129928126 in words is "one hundred twenty-nine million, nine hundred twenty-eight thousand, one hundred twenty-six".