129415872 has 42 divisors (see below), whose sum is σ = 342830404. Its totient is φ = 43086080.

The previous prime is 129415861. The next prime is 129415901. The reversal of 129415872 is 278514921.

It is a self number, because there is not a number n which added to its sum of digits gives 129415872.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 157222 + ... + 158042.

Almost surely, 2^129415872 is an apocalyptic number.

129415872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129415872 is an abundant number, since it is smaller than the sum of its proper divisors (213414532).

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

129415872 is an frugal number, since it uses more digits than its factorization.

129415872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 826 counting only the distinct ones).

The product of its digits is 40320, while the sum is 39.

The square root of 129415872 is about 11376.1097041124. The cubic root of 129415872 is about 505.8198257633.

The spelling of 129415872 in words is "one hundred twenty-nine million, four hundred fifteen thousand, eight hundred seventy-two".