129188985 has 16 divisors (see below), whose sum is σ = 211510464. Its totient is φ = 67298112.

The previous prime is 129188971. The next prime is 129188993. The reversal of 129188985 is 589881921.

It is not a de Polignac number, because 129188985 - 2⁶ = 129188921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99502 + ... + 100791.

It is an arithmetic number, because the mean of its divisors is an integer number (13219404).

Almost surely, 2^129188985 is an apocalyptic number.

129188985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129188985 is a deficient number, since it is larger than the sum of its proper divisors (82321479).

129188985 is a wasteful number, since it uses less digits than its factorization.

129188985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200344.

The product of its digits is 414720, while the sum is 51.

The square root of 129188985 is about 11366.1332475033. The cubic root of 129188985 is about 505.5240581396.

The spelling of 129188985 in words is "one hundred twenty-nine million, one hundred eighty-eight thousand, nine hundred eighty-five".