129944428 has 12 divisors (see below), whose sum is σ = 229039720. Its totient is φ = 64504512.

The previous prime is 129944383. The next prime is 129944429. The reversal of 129944428 is 824449921.

It is not an unprimeable number, because it can be changed into a prime (129944429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116301 + ... + 117412.

Almost surely, 2^129944428 is an apocalyptic number.

It is an amenable number.

129944428 is a deficient number, since it is larger than the sum of its proper divisors (99095292).

129944428 is a wasteful number, since it uses less digits than its factorization.

129944428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233856 (or 233854 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 129944428 is about 11399.3169970836. The cubic root of 129944428 is about 506.5075079113.

The spelling of 129944428 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, four hundred twenty-eight".