129912239 has 4 divisors (see below), whose sum is σ = 130051824. Its totient is φ = 129772656.

The previous prime is 129912229. The next prime is 129912271. The reversal of 129912239 is 932219921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932219921 = 37 ⋅25195133.

It is a cyclic number.

It is not a de Polignac number, because 129912239 - 2¹² = 129908143 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 (129912229) 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, 68387 + ... + 70260.

It is an arithmetic number, because the mean of its divisors is an integer number (32512956).

Almost surely, 2^129912239 is an apocalyptic number.

129912239 is a deficient number, since it is larger than the sum of its proper divisors (139585).

129912239 is an equidigital number, since it uses as much as digits as its factorization.

129912239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139584.

The product of its digits is 17496, while the sum is 38.

The square root of 129912239 is about 11397.9050268021. The cubic root of 129912239 is about 506.4656815274.

The spelling of 129912239 in words is "one hundred twenty-nine million, nine hundred twelve thousand, two hundred thirty-nine".