129252320 has 48 divisors (see below), whose sum is σ = 307132560. Its totient is φ = 51400704.

The previous prime is 129252311. The next prime is 129252349. The reversal of 129252320 is 23252921.

It is a self number, because there is not a number n which added to its sum of digits gives 129252320.

It is a congruent 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, 26384 + ... + 30896.

It is an arithmetic number, because the mean of its divisors is an integer number (6398595).

Almost surely, 2^129252320 is an apocalyptic number.

129252320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129252320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153566280).

129252320 is an abundant number, since it is smaller than the sum of its proper divisors (177880240).

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

129252320 is a wasteful number, since it uses less digits than its factorization.

129252320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707 (or 4699 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 129252320 is about 11368.9190339275. The cubic root of 129252320 is about 505.6066558302.

The spelling of 129252320 in words is "one hundred twenty-nine million, two hundred fifty-two thousand, three hundred twenty".