12442813 has 2 divisors, whose sum is σ = 12442814. Its totient is φ = 12442812.

The previous prime is 12442763. The next prime is 12442817. The reversal of 12442813 is 31824421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9474084 + 2968729 = 3078^2 + 1723^2 .

It is an emirp because it is prime and its reverse (31824421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12442813 - 2⁹ = 12442301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12442817) 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 as a sum of consecutive naturals, namely, 6221406 + 6221407.

It is an arithmetic number, because the mean of its divisors is an integer number (6221407).

Almost surely, 2^12442813 is an apocalyptic number.

It is an amenable number.

12442813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12442813 is an equidigital number, since it uses as much as digits as its factorization.

12442813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 12442813 is about 3527.4371716588. The cubic root of 12442813 is about 231.7249825302.

The spelling of 12442813 in words is "twelve million, four hundred forty-two thousand, eight hundred thirteen".