129983920 has 40 divisors (see below), whose sum is σ = 329688720. Its totient is φ = 47266560.

The previous prime is 129983897. The next prime is 129983941. The reversal of 129983920 is 29389921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 72975 + ... + 74734.

It is an arithmetic number, because the mean of its divisors is an integer number (8242218).

Almost surely, 2^129983920 is an apocalyptic number.

129983920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129983920 is an abundant number, since it is smaller than the sum of its proper divisors (199704800).

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

129983920 is a wasteful number, since it uses less digits than its factorization.

129983920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147733 (or 147727 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 129983920 is about 11401.0490745370. The cubic root of 129983920 is about 506.5588143781.

The spelling of 129983920 in words is "one hundred twenty-nine million, nine hundred eighty-three thousand, nine hundred twenty".