129118990 has 64 divisors (see below), whose sum is σ = 312076800. Its totient is φ = 37146240.

The previous prime is 129118897. The next prime is 129118993. The reversal of 129118990 is 99811921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129118993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3561 + ... + 16459.

It is an arithmetic number, because the mean of its divisors is an integer number (4876200).

Almost surely, 2^129118990 is an apocalyptic number.

129118990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129118990 is an abundant number, since it is smaller than the sum of its proper divisors (182957810).

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

129118990 is a wasteful number, since it uses less digits than its factorization.

129118990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12937.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 129118990 is about 11363.0537268817. The cubic root of 129118990 is about 505.4327434691.

The spelling of 129118990 in words is "one hundred twenty-nine million, one hundred eighteen thousand, nine hundred ninety".