242646209 has 16 divisors (see below), whose sum is σ = 266219520. Its totient is φ = 219810240.

The previous prime is 242646197. The next prime is 242646211. The reversal of 242646209 is 902646242.

It is not a de Polignac number, because 242646209 - 2⁴ = 242646193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (242646709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195539 + ... + 196775.

It is an arithmetic number, because the mean of its divisors is an integer number (16638720).

Almost surely, 2^242646209 is an apocalyptic number.

It is an amenable number.

242646209 is a deficient number, since it is larger than the sum of its proper divisors (23573311).

242646209 is a wasteful number, since it uses less digits than its factorization.

242646209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 242646209 is about 15577.1052830749. The cubic root of 242646209 is about 623.7221541699.

The spelling of 242646209 in words is "two hundred forty-two million, six hundred forty-six thousand, two hundred nine".