129487638 has 16 divisors (see below), whose sum is σ = 295971840. Its totient is φ = 36996456.

The previous prime is 129487621. The next prime is 129487643. The reversal of 129487638 is 836784921.

129487638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1541478 + ... + 1541561.

It is an arithmetic number, because the mean of its divisors is an integer number (18498240).

Almost surely, 2^129487638 is an apocalyptic number.

129487638 is an abundant number, since it is smaller than the sum of its proper divisors (166484202).

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

129487638 is a wasteful number, since it uses less digits than its factorization.

129487638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083051.

The product of its digits is 580608, while the sum is 48.

The square root of 129487638 is about 11379.2635086810. The cubic root of 129487638 is about 505.9133072327.

The spelling of 129487638 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, six hundred thirty-eight".