129387679 has 4 divisors (see below), whose sum is σ = 129412384. Its totient is φ = 129362976.

The previous prime is 129387667. The next prime is 129387683. The reversal of 129387679 is 976783921.

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 129387679 - 2²³ = 120999071 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 (129387079) by changing a digit.

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, 1047 + ... + 16120.

It is an arithmetic number, because the mean of its divisors is an integer number (32353096).

Almost surely, 2^129387679 is an apocalyptic number.

129387679 is a deficient number, since it is larger than the sum of its proper divisors (24705).

129387679 is an equidigital number, since it uses as much as digits as its factorization.

129387679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24704.

The product of its digits is 1143072, while the sum is 52.

The square root of 129387679 is about 11374.8705047574. The cubic root of 129387679 is about 505.7830924688.

The spelling of 129387679 in words is "one hundred twenty-nine million, three hundred eighty-seven thousand, six hundred seventy-nine".