1242144439 has 2 divisors, whose sum is σ = 1242144440. Its totient is φ = 1242144438.

The previous prime is 1242144433. The next prime is 1242144467. The reversal of 1242144439 is 9344412421.

It is a weak prime.

It is an emirp because it is prime and its reverse (9344412421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242144439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242144433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621072219 + 621072220.

It is an arithmetic number, because the mean of its divisors is an integer number (621072220).

Almost surely, 2^1242144439 is an apocalyptic number.

1242144439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242144439 is an equidigital number, since it uses as much as digits as its factorization.

1242144439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 34.

The square root of 1242144439 is about 35244.0695578703. The cubic root of 1242144439 is about 1074.9560289208.

The spelling of 1242144439 in words is "one billion, two hundred forty-two million, one hundred forty-four thousand, four hundred thirty-nine".