129387975 has 12 divisors (see below), whose sum is σ = 213921576. Its totient is φ = 69006880.

The previous prime is 129387971. The next prime is 129387983. The reversal of 129387975 is 579783921.

It is not a de Polignac number, because 129387975 - 2² = 129387971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129387971) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 862512 + ... + 862661.

It is an arithmetic number, because the mean of its divisors is an integer number (17826798).

Almost surely, 2^129387975 is an apocalyptic number.

129387975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129387975 is a deficient number, since it is larger than the sum of its proper divisors (84533601).

129387975 is a wasteful number, since it uses less digits than its factorization.

129387975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725186 (or 1725181 counting only the distinct ones).

The product of its digits is 952560, while the sum is 51.

The square root of 129387975 is about 11374.8835158871. The cubic root of 129387975 is about 505.7834781616.

The spelling of 129387975 in words is "one hundred twenty-nine million, three hundred eighty-seven thousand, nine hundred seventy-five".