129968920 has 32 divisors (see below), whose sum is σ = 292813200. Its totient is φ = 51919488.

The previous prime is 129968903. The next prime is 129968933. The reversal of 129968920 is 29869921.

It is a congruent number.

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, 38251 + ... + 41509.

Almost surely, 2^129968920 is an apocalyptic number.

129968920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129968920 is an abundant number, since it is smaller than the sum of its proper divisors (162844280).

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

129968920 is a wasteful number, since it uses less digits than its factorization.

129968920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267 (or 4263 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 129968920 is about 11400.3912213573. The cubic root of 129968920 is about 506.5393281870.

The spelling of 129968920 in words is "one hundred twenty-nine million, nine hundred sixty-eight thousand, nine hundred twenty".