129138886 has 16 divisors (see below), whose sum is σ = 196316208. Its totient is φ = 63705600.

The previous prime is 129138881. The next prime is 129138907. The reversal of 129138886 is 688831921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129138881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53281 + ... + 55651.

It is an arithmetic number, because the mean of its divisors is an integer number (12269763).

Almost surely, 2^129138886 is an apocalyptic number.

129138886 is a deficient number, since it is larger than the sum of its proper divisors (67177322).

129138886 is a wasteful number, since it uses less digits than its factorization.

129138886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727.

The product of its digits is 165888, while the sum is 46.

The square root of 129138886 is about 11363.9291620460. The cubic root of 129138886 is about 505.4587029178.

The spelling of 129138886 in words is "one hundred twenty-nine million, one hundred thirty-eight thousand, eight hundred eighty-six".