242538839 has 2 divisors, whose sum is σ = 242538840. Its totient is φ = 242538838.

The previous prime is 242538833. The next prime is 242538853. The reversal of 242538839 is 938835242.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242538839 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242538839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242538833) 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, 121269419 + 121269420.

It is an arithmetic number, because the mean of its divisors is an integer number (121269420).

Almost surely, 2^242538839 is an apocalyptic number.

242538839 is a deficient number, since it is larger than the sum of its proper divisors (1).

242538839 is an equidigital number, since it uses as much as digits as its factorization.

242538839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 44.

The square root of 242538839 is about 15573.6584976042. The cubic root of 242538839 is about 623.6301423911.

The spelling of 242538839 in words is "two hundred forty-two million, five hundred thirty-eight thousand, eight hundred thirty-nine".