12127639 has 4 divisors (see below), whose sum is σ = 12137256. Its totient is φ = 12118024.

The previous prime is 12127637. The next prime is 12127663. The reversal of 12127639 is 93672121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12127639 - 2¹ = 12127637 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12127639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2569 + ... + 5554.

It is an arithmetic number, because the mean of its divisors is an integer number (3034314).

Almost surely, 2^12127639 is an apocalyptic number.

12127639 is a deficient number, since it is larger than the sum of its proper divisors (9617).

12127639 is an equidigital number, since it uses as much as digits as its factorization.

12127639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9616.

The product of its digits is 4536, while the sum is 31.

The square root of 12127639 is about 3482.4759869955. The cubic root of 12127639 is about 229.7517106393.

The spelling of 12127639 in words is "twelve million, one hundred twenty-seven thousand, six hundred thirty-nine".