129120638 has 8 divisors (see below), whose sum is σ = 194300688. Its totient is φ = 64353744.

The previous prime is 129120623. The next prime is 129120647. The reversal of 129120638 is 836021921.

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

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, 102506 + ... + 103757.

It is an arithmetic number, because the mean of its divisors is an integer number (24287586).

Almost surely, 2^129120638 is an apocalyptic number.

129120638 is a deficient number, since it is larger than the sum of its proper divisors (65180050).

129120638 is a wasteful number, since it uses less digits than its factorization.

129120638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206578.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 129120638 is about 11363.1262423683. The cubic root of 129120638 is about 505.4348938102.

The spelling of 129120638 in words is "one hundred twenty-nine million, one hundred twenty thousand, six hundred thirty-eight".