129181930 has 16 divisors (see below), whose sum is σ = 232657920. Its totient is φ = 51643792.

The previous prime is 129181891. The next prime is 129181951. The reversal of 129181930 is 39181921.

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, 29631 + ... + 33709.

It is an arithmetic number, because the mean of its divisors is an integer number (14541120).

Almost surely, 2^129181930 is an apocalyptic number.

129181930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129181930 is a deficient number, since it is larger than the sum of its proper divisors (103475990).

129181930 is a wasteful number, since it uses less digits than its factorization.

129181930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7253.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 129181930 is about 11365.8228914584. The cubic root of 129181930 is about 505.5148557628.

Subtracting from 129181930 its reverse (39181921), we obtain a palindrome (90000009).

The spelling of 129181930 in words is "one hundred twenty-nine million, one hundred eighty-one thousand, nine hundred thirty".