129989930 has 16 divisors (see below), whose sum is σ = 267408000. Its totient is φ = 44567952.

The previous prime is 129989927. The next prime is 129989957. The reversal of 129989930 is 39989921.

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, 928430 + ... + 928569.

It is an arithmetic number, because the mean of its divisors is an integer number (16713000).

Almost surely, 2^129989930 is an apocalyptic number.

129989930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129989930 is an abundant number, since it is smaller than the sum of its proper divisors (137418070).

129989930 is a wasteful number, since it uses less digits than its factorization.

129989930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857013.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 129989930 is about 11401.3126437266. The cubic root of 129989930 is about 506.5666214247.

Subtracting from 129989930 its reverse (39989921), we obtain a palindrome (90000009).

The spelling of 129989930 in words is "one hundred twenty-nine million, nine hundred eighty-nine thousand, nine hundred thirty".