129361808 has 40 divisors (see below), whose sum is σ = 262483200. Its totient is φ = 61679744.

The previous prime is 129361801. The next prime is 129361829. The reversal of 129361808 is 808163921.

It is not an unprimeable number, because it can be changed into a prime (129361801) 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, 36833 + ... + 40191.

It is an arithmetic number, because the mean of its divisors is an integer number (6562080).

Almost surely, 2^129361808 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 129361808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131241600).

129361808 is an abundant number, since it is smaller than the sum of its proper divisors (133121392).

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

129361808 is a wasteful number, since it uses less digits than its factorization.

129361808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479 (or 3473 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 129361808 is about 11373.7332481468. The cubic root of 129361808 is about 505.7493798652.

The spelling of 129361808 in words is "one hundred twenty-nine million, three hundred sixty-one thousand, eight hundred eight".