129118140 has 36 divisors (see below), whose sum is σ = 391658904. Its totient is φ = 34431456.

The previous prime is 129118133. The next prime is 129118147. The reversal of 129118140 is 41811921.

It is an interprime number because it is at equal distance from previous prime (129118133) and next prime (129118147).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129118147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 358482 + ... + 358841.

It is an arithmetic number, because the mean of its divisors is an integer number (10879414).

Almost surely, 2^129118140 is an apocalyptic number.

129118140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129118140 is an abundant number, since it is smaller than the sum of its proper divisors (262540764).

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

129118140 is a wasteful number, since it uses less digits than its factorization.

129118140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717338 (or 717333 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 129118140 is about 11363.0163249025. The cubic root of 129118140 is about 505.4316343661.

The spelling of 129118140 in words is "one hundred twenty-nine million, one hundred eighteen thousand, one hundred forty".