129660012 has 36 divisors (see below), whose sum is σ = 328135080. Its totient is φ = 43169472.

The previous prime is 129659989. The next prime is 129660023. The reversal of 129660012 is 210066921.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41439 + ... + 44457.

Almost surely, 2^129660012 is an apocalyptic number.

129660012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129660012 is an abundant number, since it is smaller than the sum of its proper divisors (198475068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129660012 is a wasteful number, since it uses less digits than its factorization.

129660012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222 (or 4217 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 129660012 is about 11386.8350299809. The cubic root of 129660012 is about 506.1376983638.

The spelling of 129660012 in words is "one hundred twenty-nine million, six hundred sixty thousand, twelve".