129432280 has 16 divisors (see below), whose sum is σ = 291222720. Its totient is φ = 51772896.

The previous prime is 129432221. The next prime is 129432283. The reversal of 129432280 is 82234921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129432283) 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, 1617864 + ... + 1617943.

It is an arithmetic number, because the mean of its divisors is an integer number (18201420).

Almost surely, 2^129432280 is an apocalyptic number.

129432280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129432280 is an abundant number, since it is smaller than the sum of its proper divisors (161790440).

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

129432280 is a wasteful number, since it uses less digits than its factorization.

129432280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235818 (or 3235814 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 129432280 is about 11376.8308416712. The cubic root of 129432280 is about 505.8412016601.

The spelling of 129432280 in words is "one hundred twenty-nine million, four hundred thirty-two thousand, two hundred eighty".