129187044 has 144 divisors (see below), whose sum is σ = 402554880. Its totient is φ = 34119360.

The previous prime is 129187043. The next prime is 129187073. The reversal of 129187044 is 440781921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (129187043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179317 + ... + 180035.

It is an arithmetic number, because the mean of its divisors is an integer number (2795520).

Almost surely, 2^129187044 is an apocalyptic number.

129187044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129187044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201277440).

129187044 is an abundant number, since it is smaller than the sum of its proper divisors (273367836).

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

129187044 is a wasteful number, since it uses less digits than its factorization.

129187044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 129187044 is about 11366.0478619439. The cubic root of 129187044 is about 505.5215263780.

The spelling of 129187044 in words is "one hundred twenty-nine million, one hundred eighty-seven thousand, forty-four".