129609324 has 72 divisors (see below), whose sum is σ = 368196192. Its totient is φ = 38142720.

The previous prime is 129609281. The next prime is 129609331. The reversal of 129609324 is 423906921.

129609324 is a `hidden beast` number, since 1 + 29 + 609 + 3 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 4744 + ... + 16784.

It is an arithmetic number, because the mean of its divisors is an integer number (5113836).

Almost surely, 2^129609324 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 129609324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184098096).

129609324 is an abundant number, since it is smaller than the sum of its proper divisors (238586868).

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

129609324 is a wasteful number, since it uses less digits than its factorization.

129609324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12087 (or 12082 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 129609324 is about 11384.6090841978. The cubic root of 129609324 is about 506.0717349489.

The spelling of 129609324 in words is "one hundred twenty-nine million, six hundred nine thousand, three hundred twenty-four".