129543420 has 96 divisors (see below), whose sum is σ = 377266176. Its totient is φ = 33177600.

The previous prime is 129543397. The next prime is 129543437. The reversal of 129543420 is 24345921.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 477885 + ... + 478155.

It is an arithmetic number, because the mean of its divisors is an integer number (3929856).

Almost surely, 2^129543420 is an apocalyptic number.

129543420 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 129543420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188633088).

129543420 is an abundant number, since it is smaller than the sum of its proper divisors (247722756).

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

129543420 is a wasteful number, since it uses less digits than its factorization.

129543420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 569 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 129543420 is about 11381.7142821282. The cubic root of 129543420 is about 505.9859442944.

The spelling of 129543420 in words is "one hundred twenty-nine million, five hundred forty-three thousand, four hundred twenty".