129442320 has 240 divisors, whose sum is σ = 519073920. Its totient is φ = 29562624.

The previous prime is 129442309. The next prime is 129442333. The reversal of 129442320 is 23244921.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105229 + ... + 106451.

It is an arithmetic number, because the mean of its divisors is an integer number (2162808).

Almost surely, 2^129442320 is an apocalyptic number.

129442320 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 129442320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259536960).

129442320 is an abundant number, since it is smaller than the sum of its proper divisors (389631600).

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

129442320 is a wasteful number, since it uses less digits than its factorization.

129442320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 129442320 is about 11377.2720807758. The cubic root of 129442320 is about 505.8542806085.

The spelling of 129442320 in words is "one hundred twenty-nine million, four hundred forty-two thousand, three hundred twenty".