129971980 has 24 divisors (see below), whose sum is σ = 273208320. Its totient is φ = 51937920.

The previous prime is 129971969. The next prime is 129971981. The reversal of 129971980 is 89179921.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 129971980.

It is not an unprimeable number, because it can be changed into a prime (129971981) by changing a digit.

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, 23040 + ... + 28120.

It is an arithmetic number, because the mean of its divisors is an integer number (11383680).

Almost surely, 2^129971980 is an apocalyptic number.

129971980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129971980 is an abundant number, since it is smaller than the sum of its proper divisors (143236340).

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

129971980 is a wasteful number, since it uses less digits than its factorization.

129971980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369 (or 6367 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 129971980 is about 11400.5254264880. The cubic root of 129971980 is about 506.5433034917.

The spelling of 129971980 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, nine hundred eighty".