129911808 has 88 divisors (see below), whose sum is σ = 373012528. Its totient is φ = 39960576.

The previous prime is 129911801. The next prime is 129911833. The reversal of 129911808 is 808119921.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (129911801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38310 + ... + 41562.

Almost surely, 2^129911808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129911808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186506264).

129911808 is an abundant number, since it is smaller than the sum of its proper divisors (243100720).

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

129911808 is a wasteful number, since it uses less digits than its factorization.

129911808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289 (or 3271 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 129911808 is about 11397.8861198031. The cubic root of 129911808 is about 506.4651214391.

The spelling of 129911808 in words is "one hundred twenty-nine million, nine hundred eleven thousand, eight hundred eight".