242539985 has 4 divisors (see below), whose sum is σ = 291047988. Its totient is φ = 194031984.

The previous prime is 242539981. The next prime is 242539987. The reversal of 242539985 is 589935242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39790864 + 202749121 = 6308^2 + 14239^2 .

It is a cyclic number.

It is not a de Polignac number, because 242539985 - 2² = 242539981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242539981) 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 in 3 ways as a sum of consecutive naturals, for example, 24253994 + ... + 24254003.

It is an arithmetic number, because the mean of its divisors is an integer number (72761997).

Almost surely, 2^242539985 is an apocalyptic number.

It is an amenable number.

242539985 is a deficient number, since it is larger than the sum of its proper divisors (48508003).

242539985 is an equidigital number, since it uses as much as digits as its factorization.

242539985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48508002.

The product of its digits is 777600, while the sum is 47.

The square root of 242539985 is about 15573.6952904569. The cubic root of 242539985 is about 623.6311246104.

The spelling of 242539985 in words is "two hundred forty-two million, five hundred thirty-nine thousand, nine hundred eighty-five".