129789638 has 8 divisors (see below), whose sum is σ = 212383080. Its totient is φ = 58995280.

The previous prime is 129789619. The next prime is 129789659. The reversal of 129789638 is 836987921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 129789638.

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 3 ways as a sum of consecutive naturals, for example, 2949743 + ... + 2949786.

It is an arithmetic number, because the mean of its divisors is an integer number (26547885).

Almost surely, 2^129789638 is an apocalyptic number.

129789638 is a deficient number, since it is larger than the sum of its proper divisors (82593442).

129789638 is a wasteful number, since it uses less digits than its factorization.

129789638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5899542.

The product of its digits is 1306368, while the sum is 53.

The square root of 129789638 is about 11392.5255321197. The cubic root of 129789638 is about 506.3063104970.

The spelling of 129789638 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, six hundred thirty-eight".