129555984 has 40 divisors (see below), whose sum is σ = 352303840. Its totient is φ = 40912128.

The previous prime is 129555977. The next prime is 129555989. The reversal of 129555984 is 489555921.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (129555989) 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, 70117 + ... + 71940.

It is an arithmetic number, because the mean of its divisors is an integer number (8807596).

Almost surely, 2^129555984 is an apocalyptic number.

It is an amenable number.

129555984 is an abundant number, since it is smaller than the sum of its proper divisors (222747856).

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

129555984 is a wasteful number, since it uses less digits than its factorization.

129555984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142087 (or 142081 counting only the distinct ones).

The product of its digits is 648000, while the sum is 48.

The square root of 129555984 is about 11382.2662066919. The cubic root of 129555984 is about 506.0023017492.

The spelling of 129555984 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, nine hundred eighty-four".