129323808 has 72 divisors (see below), whose sum is σ = 369847296. Its totient is φ = 42864000.

The previous prime is 129323801. The next prime is 129323809. The reversal of 129323808 is 808323921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

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 (129323801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53833 + ... + 56183.

It is an arithmetic number, because the mean of its divisors is an integer number (5136768).

Almost surely, 2^129323808 is an apocalyptic number.

129323808 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 129323808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184923648).

129323808 is an abundant number, since it is smaller than the sum of its proper divisors (240523488).

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

129323808 is a wasteful number, since it uses less digits than its factorization.

129323808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 129323808 is about 11372.0626097467. The cubic root of 129323808 is about 505.6998537625.

The spelling of 129323808 in words is "one hundred twenty-nine million, three hundred twenty-three thousand, eight hundred eight".