242686209 has 4 divisors (see below), whose sum is σ = 323581616. Its totient is φ = 161790804.

The previous prime is 242686163. The next prime is 242686267. The reversal of 242686209 is 902686242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 242686209 - 2⁸ = 242685953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242686289) 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 in 3 ways as a sum of consecutive naturals, for example, 40447699 + ... + 40447704.

It is an arithmetic number, because the mean of its divisors is an integer number (80895404).

Almost surely, 2^242686209 is an apocalyptic number.

It is an amenable number.

242686209 is a deficient number, since it is larger than the sum of its proper divisors (80895407).

242686209 is an equidigital number, since it uses as much as digits as its factorization.

242686209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80895406.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 242686209 is about 15578.3891657642. The cubic root of 242686209 is about 623.7564256242.

The spelling of 242686209 in words is "two hundred forty-two million, six hundred eighty-six thousand, two hundred nine".