129412320 has 96 divisors (see below), whose sum is σ = 409328640. Its totient is φ = 34368000.

The previous prime is 129412307. The next prime is 129412331. The reversal of 129412320 is 23214921.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171945 + ... + 172695.

It is an arithmetic number, because the mean of its divisors is an integer number (4263840).

Almost surely, 2^129412320 is an apocalyptic number.

129412320 is a gapful number since it is divisible by the number (10) 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 129412320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204664320).

129412320 is an abundant number, since it is smaller than the sum of its proper divisors (279916320).

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

129412320 is a wasteful number, since it uses less digits than its factorization.

129412320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 129412320 is about 11375.9535864032. The cubic root of 129412320 is about 505.8151980763.

The spelling of 129412320 in words is "one hundred twenty-nine million, four hundred twelve thousand, three hundred twenty".