129924720 has 120 divisors (see below), whose sum is σ = 450483072. Its totient is φ = 33523200.

The previous prime is 129924713. The next prime is 129924721. The reversal of 129924720 is 27429921.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129924721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19410 + ... + 25230.

Almost surely, 2^129924720 is an apocalyptic number.

129924720 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 129924720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225241536).

129924720 is an abundant number, since it is smaller than the sum of its proper divisors (320558352).

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

129924720 is a wasteful number, since it uses less digits than its factorization.

129924720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5871 (or 5862 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 129924720 is about 11398.4525265494. The cubic root of 129924720 is about 506.4819001577.

The spelling of 129924720 in words is "one hundred twenty-nine million, nine hundred twenty-four thousand, seven hundred twenty".