129140985 has 16 divisors (see below), whose sum is σ = 207394560. Its totient is φ = 68618880.

The previous prime is 129140971. The next prime is 129140987. The reversal of 129140985 is 589041921.

It is not a de Polignac number, because 129140985 - 2⁴ = 129140969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129140987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11820 + ... + 19949.

It is an arithmetic number, because the mean of its divisors is an integer number (12962160).

Almost surely, 2^129140985 is an apocalyptic number.

129140985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129140985 is a deficient number, since it is larger than the sum of its proper divisors (78253575).

129140985 is a wasteful number, since it uses less digits than its factorization.

129140985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32048.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 129140985 is about 11364.0215152911. The cubic root of 129140985 is about 505.4614414476.

The spelling of 129140985 in words is "one hundred twenty-nine million, one hundred forty thousand, nine hundred eighty-five".