129980 has 24 divisors (see below), whose sum is σ = 279888. Its totient is φ = 50688.

The previous prime is 129971. The next prime is 130003. The reversal of 129980 is 89921.

It is a congruent number.

It is an unprimeable number.

129980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292 + ... + 1388.

It is an arithmetic number, because the mean of its divisors is an integer number (11662).

2¹²⁹⁹⁸⁰ is an apocalyptic number.

129980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129980 is an abundant number, since it is smaller than the sum of its proper divisors (149908).

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

129980 is a wasteful number, since it uses less digits than its factorization.

129980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 129980 is about 360.5273914698. The cubic root of 129980 is about 50.6553722131.

The spelling of 129980 in words is "one hundred twenty-nine thousand, nine hundred eighty".