129789623 has 4 divisors (see below), whose sum is σ = 129914400. Its totient is φ = 129664848.

The previous prime is 129789619. The next prime is 129789659. The reversal of 129789623 is 326987921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129789623 - 2² = 129789619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129789613) 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 3 ways as a sum of consecutive naturals, for example, 60815 + ... + 62912.

It is an arithmetic number, because the mean of its divisors is an integer number (32478600).

Almost surely, 2^129789623 is an apocalyptic number.

129789623 is a deficient number, since it is larger than the sum of its proper divisors (124777).

129789623 is a wasteful number, since it uses less digits than its factorization.

129789623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124776.

The product of its digits is 326592, while the sum is 47.

The square root of 129789623 is about 11392.5248737933. The cubic root of 129789623 is about 506.3062909921.

The spelling of 129789623 in words is "one hundred twenty-nine million, seven hundred eighty-nine thousand, six hundred twenty-three".