129239924 has 12 divisors (see below), whose sum is σ = 246730848. Its totient is φ = 58745400.

The previous prime is 129239923. The next prime is 129239963. The reversal of 129239924 is 429932921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129239923) 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, 1468592 + ... + 1468679.

It is an arithmetic number, because the mean of its divisors is an integer number (20560904).

Almost surely, 2^129239924 is an apocalyptic number.

It is an amenable number.

129239924 is a deficient number, since it is larger than the sum of its proper divisors (117490924).

129239924 is a wasteful number, since it uses less digits than its factorization.

129239924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937286 (or 2937284 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 129239924 is about 11368.3738502919. The cubic root of 129239924 is about 505.5904918380.

The spelling of 129239924 in words is "one hundred twenty-nine million, two hundred thirty-nine thousand, nine hundred twenty-four".