129728126 has 16 divisors (see below), whose sum is σ = 212504688. Its totient is φ = 58905600.

The previous prime is 129728117. The next prime is 129728167. The reversal of 129728126 is 621827921.

It is a self number, because there is not a number n which added to its sum of digits gives 129728126.

It is a congruent number.

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, 23486 + ... + 28478.

It is an arithmetic number, because the mean of its divisors is an integer number (13281543).

Almost surely, 2^129728126 is an apocalyptic number.

129728126 is a deficient number, since it is larger than the sum of its proper divisors (82776562).

129728126 is a wasteful number, since it uses less digits than its factorization.

129728126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6187.

The product of its digits is 24192, while the sum is 38.

The square root of 129728126 is about 11389.8255473910. The cubic root of 129728126 is about 506.2263122382.

The spelling of 129728126 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, one hundred twenty-six".