129898920 has 32 divisors (see below), whose sum is σ = 389697120. Its totient is φ = 34639680.

The previous prime is 129898907. The next prime is 129898927. The reversal of 129898920 is 29898921.

It is a self number, because there is not a number n which added to its sum of digits gives 129898920.

It is not an unprimeable number, because it can be changed into a prime (129898927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541126 + ... + 541365.

It is an arithmetic number, because the mean of its divisors is an integer number (12178035).

Almost surely, 2^129898920 is an apocalyptic number.

129898920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129898920 is an abundant number, since it is smaller than the sum of its proper divisors (259798200).

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

129898920 is a wasteful number, since it uses less digits than its factorization.

129898920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082505 (or 1082501 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 129898920 is about 11397.3207377875. The cubic root of 129898920 is about 506.4483727990.

Subtracting from 129898920 its reverse (29898921), we obtain a palindrome (99999999).

The spelling of 129898920 in words is "one hundred twenty-nine million, eight hundred ninety-eight thousand, nine hundred twenty".