12239939 has 2 divisors, whose sum is σ = 12239940. Its totient is φ = 12239938.

The previous prime is 12239911. The next prime is 12239951. The reversal of 12239939 is 93993221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12239939 is a prime.

It is a super-2 number, since 2×12239939² = 299632213447442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12239959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6119969 + 6119970.

It is an arithmetic number, because the mean of its divisors is an integer number (6119970).

Almost surely, 2^12239939 is an apocalyptic number.

12239939 is a deficient number, since it is larger than the sum of its proper divisors (1).

12239939 is an equidigital number, since it uses as much as digits as its factorization.

12239939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 12239939 is about 3498.5624190516. The cubic root of 12239939 is about 230.4586876584.

The spelling of 12239939 in words is "twelve million, two hundred thirty-nine thousand, nine hundred thirty-nine".