129226916 has 72 divisors (see below), whose sum is σ = 290449656. Its totient is φ = 49835520.

The previous prime is 129226901. The next prime is 129226919. The reversal of 129226916 is 619622921.

It can be written as a sum of positive squares in 4 ways, for example, as 313600 + 128913316 = 560^2 + 11354^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129226916.

It is not an unprimeable number, because it can be changed into a prime (129226919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103850 + ... + 105086.

It is an arithmetic number, because the mean of its divisors is an integer number (4034023).

Almost surely, 2^129226916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129226916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145224828).

129226916 is an abundant number, since it is smaller than the sum of its proper divisors (161222740).

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

129226916 is a wasteful number, since it uses less digits than its factorization.

129226916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1300 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 129226916 is about 11367.8017224088. The cubic root of 129226916 is about 505.5735287058.

The spelling of 129226916 in words is "one hundred twenty-nine million, two hundred twenty-six thousand, nine hundred sixteen".