129425985 has 64 divisors (see below), whose sum is σ = 256435200. Its totient is φ = 61496064.

The previous prime is 129425983. The next prime is 129425987. The reversal of 129425985 is 589524921.

It is a happy number.

129425985 is a `hidden beast` number, since 12 + 9 + 42 + 598 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (129425983) and next prime (129425987).

It is not a de Polignac number, because 129425985 - 2¹ = 129425983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129425985.

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 63 ways as a sum of consecutive naturals, for example, 49624 + ... + 52166.

It is an arithmetic number, because the mean of its divisors is an integer number (4006800).

Almost surely, 2^129425985 is an apocalyptic number.

129425985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129425985 is a deficient number, since it is larger than the sum of its proper divisors (127009215).

129425985 is a wasteful number, since it uses less digits than its factorization.

129425985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599 (or 2593 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 129425985 is about 11376.5541795396. The cubic root of 129425985 is about 505.8330009186.

The spelling of 129425985 in words is "one hundred twenty-nine million, four hundred twenty-five thousand, nine hundred eighty-five".