129985980 has 48 divisors (see below), whose sum is σ = 366221184. Its totient is φ = 34447680.

The previous prime is 129985979. The next prime is 129985991. The reversal of 129985980 is 89589921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3135 + ... + 16425.

It is an arithmetic number, because the mean of its divisors is an integer number (7629608).

Almost surely, 2^129985980 is an apocalyptic number.

129985980 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 129985980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183110592).

129985980 is an abundant number, since it is smaller than the sum of its proper divisors (236235204).

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

129985980 is a wasteful number, since it uses less digits than its factorization.

129985980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466 (or 13464 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 51.

The square root of 129985980 is about 11401.1394167425. The cubic root of 129985980 is about 506.5614903646.

The spelling of 129985980 in words is "one hundred twenty-nine million, nine hundred eighty-five thousand, nine hundred eighty".