129425986 has 8 divisors (see below), whose sum is σ = 204356880. Its totient is φ = 61307028.

The previous prime is 129425983. The next prime is 129425987. The reversal of 129425986 is 689524921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (129425983) 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, 1702936 + ... + 1703011.

It is an arithmetic number, because the mean of its divisors is an integer number (25544610).

Almost surely, 2^129425986 is an apocalyptic number.

129425986 is a deficient number, since it is larger than the sum of its proper divisors (74930894).

129425986 is a wasteful number, since it uses less digits than its factorization.

129425986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405968.

The product of its digits is 311040, while the sum is 46.

The square root of 129425986 is about 11376.5542234896. The cubic root of 129425986 is about 505.8330022214.

The spelling of 129425986 in words is "one hundred twenty-nine million, four hundred twenty-five thousand, nine hundred eighty-six".