129743988 has 24 divisors (see below), whose sum is σ = 330257760. Its totient is φ = 39316320.

The previous prime is 129743987. The next prime is 129743993. The reversal of 129743988 is 889347921.

It is a self number, because there is not a number n which added to its sum of digits gives 129743988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129743981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491323 + ... + 491586.

It is an arithmetic number, because the mean of its divisors is an integer number (13760740).

Almost surely, 2^129743988 is an apocalyptic number.

It is an amenable number.

129743988 is an abundant number, since it is smaller than the sum of its proper divisors (200513772).

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

129743988 is a wasteful number, since it uses less digits than its factorization.

129743988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982927 (or 982925 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 129743988 is about 11390.5218493272. The cubic root of 129743988 is about 506.2469436792.

The spelling of 129743988 in words is "one hundred twenty-nine million, seven hundred forty-three thousand, nine hundred eighty-eight".