129857980 has 24 divisors (see below), whose sum is σ = 311659488. Its totient is φ = 44522688.

The previous prime is 129857957. The next prime is 129858007. The reversal of 129857980 is 89758921.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463639 + ... + 463918.

It is an arithmetic number, because the mean of its divisors is an integer number (12985812).

Almost surely, 2^129857980 is an apocalyptic number.

129857980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129857980 is an abundant number, since it is smaller than the sum of its proper divisors (181801508).

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

129857980 is a wasteful number, since it uses less digits than its factorization.

129857980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927573 (or 927571 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 129857980 is about 11395.5245601069. The cubic root of 129857980 is about 506.3951617459.

The spelling of 129857980 in words is "one hundred twenty-nine million, eight hundred fifty-seven thousand, nine hundred eighty".