129981888 has 224 divisors, whose sum is σ = 416966400. Its totient is φ = 39564288.

The previous prime is 129981877. The next prime is 129981893. The reversal of 129981888 is 888189921.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1214731 + ... + 1214837.

Almost surely, 2^129981888 is an apocalyptic number.

129981888 is a gapful number since it is divisible by the number (18) 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 129981888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208483200).

129981888 is an abundant number, since it is smaller than the sum of its proper divisors (286984512).

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

129981888 is a wasteful number, since it uses less digits than its factorization.

129981888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 168 counting only the distinct ones).

The product of its digits is 663552, while the sum is 54.

The square root of 129981888 is about 11400.9599595824. The cubic root of 129981888 is about 506.5561747365.

The spelling of 129981888 in words is "one hundred twenty-nine million, nine hundred eighty-one thousand, eight hundred eighty-eight".