129115990 has 16 divisors (see below), whose sum is σ = 232749360. Its totient is φ = 51570720.

The previous prime is 129115981. The next prime is 129115993. The reversal of 129115990 is 99511921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129115993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2016 + ... + 16195.

It is an arithmetic number, because the mean of its divisors is an integer number (14546835).

Almost surely, 2^129115990 is an apocalyptic number.

129115990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129115990 is a deficient number, since it is larger than the sum of its proper divisors (103633370).

129115990 is a wasteful number, since it uses less digits than its factorization.

129115990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18927.

The product of its (nonzero) digits is 7290, while the sum is 37.

The square root of 129115990 is about 11362.9217193467. The cubic root of 129115990 is about 505.4288289662.

The spelling of 129115990 in words is "one hundred twenty-nine million, one hundred fifteen thousand, nine hundred ninety".