129969228 has 24 divisors (see below), whose sum is σ = 316447488. Its totient is φ = 41439376.

The previous prime is 129969163. The next prime is 129969247. The reversal of 129969228 is 822969921.

It is a happy 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, 235176 + ... + 235727.

It is an arithmetic number, because the mean of its divisors is an integer number (13185312).

Almost surely, 2^129969228 is an apocalyptic number.

It is an amenable number.

129969228 is an abundant number, since it is smaller than the sum of its proper divisors (186478260).

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

129969228 is a wasteful number, since it uses less digits than its factorization.

129969228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470933 (or 470931 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 129969228 is about 11400.4047296576. The cubic root of 129969228 is about 506.5397283185.

The spelling of 129969228 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, two hundred twenty-eight".