129919878 has 36 divisors (see below), whose sum is σ = 309414924. Its totient is φ = 39369000.

The previous prime is 129919871. The next prime is 129919883. The reversal of 129919878 is 878919921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129919871) 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 17 ways as a sum of consecutive naturals, for example, 27648 + ... + 32003.

It is an arithmetic number, because the mean of its divisors is an integer number (8594859).

Almost surely, 2^129919878 is an apocalyptic number.

129919878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129919878 is an abundant number, since it is smaller than the sum of its proper divisors (179495046).

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

129919878 is a wasteful number, since it uses less digits than its factorization.

129919878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59681 (or 59667 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 129919878 is about 11398.2401273179. The cubic root of 129919878 is about 506.4756082685.

The spelling of 129919878 in words is "one hundred twenty-nine million, nine hundred nineteen thousand, eight hundred seventy-eight".