129988368 has 120 divisors (see below), whose sum is σ = 384573600. Its totient is φ = 42036480.

The previous prime is 129988361. The next prime is 129988379. The reversal of 129988368 is 863889921.

It is a happy number.

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 not an unprimeable number, because it can be changed into a prime (129988361) 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 23 ways as a sum of consecutive naturals, for example, 726103 + ... + 726281.

It is an arithmetic number, because the mean of its divisors is an integer number (3204780).

Almost surely, 2^129988368 is an apocalyptic number.

129988368 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 129988368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192286800).

129988368 is an abundant number, since it is smaller than the sum of its proper divisors (254585232).

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

129988368 is a wasteful number, since it uses less digits than its factorization.

129988368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 225 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 129988368 is about 11401.2441426364. The cubic root of 129988368 is about 506.5645923951.

The spelling of 129988368 in words is "one hundred twenty-nine million, nine hundred eighty-eight thousand, three hundred sixty-eight".