129886779 has 16 divisors (see below), whose sum is σ = 189356544. Its totient is φ = 78540000.

The previous prime is 129886769. The next prime is 129886781. The reversal of 129886779 is 977688921.

It is not a de Polignac number, because 129886779 - 2²³ = 121498171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129886769) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11029 + ... + 19529.

It is an arithmetic number, because the mean of its divisors is an integer number (11834784).

Almost surely, 2^129886779 is an apocalyptic number.

129886779 is a deficient number, since it is larger than the sum of its proper divisors (59469765).

129886779 is a wasteful number, since it uses less digits than its factorization.

129886779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8978.

The product of its digits is 3048192, while the sum is 57.

The square root of 129886779 is about 11396.7881001623. The cubic root of 129886779 is about 506.4325939117.

The spelling of 129886779 in words is "one hundred twenty-nine million, eight hundred eighty-six thousand, seven hundred seventy-nine".