129405280 has 48 divisors (see below), whose sum is σ = 313997040. Its totient is φ = 50360832.

The previous prime is 129405271. The next prime is 129405281. The reversal of 129405280 is 82504921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129405281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5010 + ... + 16849.

It is an arithmetic number, because the mean of its divisors is an integer number (6541605).

Almost surely, 2^129405280 is an apocalyptic number.

129405280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129405280 is an abundant number, since it is smaller than the sum of its proper divisors (184591760).

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

129405280 is a wasteful number, since it uses less digits than its factorization.

129405280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21911 (or 21903 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 129405280 is about 11375.6441575851. The cubic root of 129405280 is about 505.8060258337.

The spelling of 129405280 in words is "one hundred twenty-nine million, four hundred five thousand, two hundred eighty".