12123647 has 2 divisors, whose sum is σ = 12123648. Its totient is φ = 12123646.

The previous prime is 12123637. The next prime is 12123649. The reversal of 12123647 is 74632121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12123647 - 2¹⁰ = 12122623 is a prime.

Together with 12123649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123649) 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 as a sum of consecutive naturals, namely, 6061823 + 6061824.

It is an arithmetic number, because the mean of its divisors is an integer number (6061824).

Almost surely, 2^12123647 is an apocalyptic number.

12123647 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123647 is an equidigital number, since it uses as much as digits as its factorization.

12123647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 12123647 is about 3481.9027843982. The cubic root of 12123647 is about 229.7264990962.

Adding to 12123647 its reverse (74632121), we get a palindrome (86755768).

The spelling of 12123647 in words is "twelve million, one hundred twenty-three thousand, six hundred forty-seven".