129878189 has 24 divisors (see below), whose sum is σ = 157291200. Its totient is φ = 104993280.

The previous prime is 129878173. The next prime is 129878191. The reversal of 129878189 is 981878921.

It is a happy number.

It is not a de Polignac number, because 129878189 - 2⁴ = 129878173 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129878189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129878389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289037 + ... + 289485.

It is an arithmetic number, because the mean of its divisors is an integer number (6553800).

Almost surely, 2^129878189 is an apocalyptic number.

It is an amenable number.

129878189 is a deficient number, since it is larger than the sum of its proper divisors (27413011).

129878189 is an equidigital number, since it uses as much as digits as its factorization.

129878189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 530 counting only the distinct ones).

The product of its digits is 580608, while the sum is 53.

The square root of 129878189 is about 11396.4112333664. The cubic root of 129878189 is about 506.4214294398.

The spelling of 129878189 in words is "one hundred twenty-nine million, eight hundred seventy-eight thousand, one hundred eighty-nine".