129978120 has 32 divisors (see below), whose sum is σ = 389934720. Its totient is φ = 34660800.

The previous prime is 129978119. The next prime is 129978131. The reversal of 129978120 is 21879921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541456 + ... + 541695.

It is an arithmetic number, because the mean of its divisors is an integer number (12185460).

Almost surely, 2^129978120 is an apocalyptic number.

129978120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129978120 is an abundant number, since it is smaller than the sum of its proper divisors (259956600).

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

129978120 is a wasteful number, since it uses less digits than its factorization.

129978120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083165 (or 1083161 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 129978120 is about 11400.7947091420. The cubic root of 129978120 is about 506.5512798953.

The spelling of 129978120 in words is "one hundred twenty-nine million, nine hundred seventy-eight thousand, one hundred twenty".