242847889 has 2 divisors, whose sum is σ = 242847890. Its totient is φ = 242847888.

The previous prime is 242847887. The next prime is 242847901. The reversal of 242847889 is 988748242.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219276864 + 23571025 = 14808^2 + 4855^2 .

It is a cyclic number.

It is not a de Polignac number, because 242847889 - 2¹ = 242847887 is a prime.

Together with 242847887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (242847887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121423944 + 121423945.

It is an arithmetic number, because the mean of its divisors is an integer number (121423945).

Almost surely, 2^242847889 is an apocalyptic number.

It is an amenable number.

242847889 is a deficient number, since it is larger than the sum of its proper divisors (1).

242847889 is an equidigital number, since it uses as much as digits as its factorization.

242847889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2064384, while the sum is 52.

The square root of 242847889 is about 15583.5775417585. The cubic root of 242847889 is about 623.8949124821.

The spelling of 242847889 in words is "two hundred forty-two million, eight hundred forty-seven thousand, eight hundred eighty-nine".