242644 has 6 divisors (see below), whose sum is σ = 424634. Its totient is φ = 121320.

The previous prime is 242639. The next prime is 242647. The reversal of 242644 is 446242.

It can be written as a sum of positive squares in only one way, i.e., 169744 + 72900 = 412^2 + 270^2 .

It is a super-2 number, since 2×242644² = 117752221472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242647) by changing a digit.

242644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30327 + ... + 30334.

2²⁴²⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

242644 is a deficient number, since it is larger than the sum of its proper divisors (181990).

242644 is a wasteful number, since it uses less digits than its factorization.

242644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60665 (or 60663 counting only the distinct ones).

The product of its digits is 1536, while the sum is 22.

The square root of 242644 is about 492.5890782386. The cubic root of 242644 is about 62.3720261419.

Adding to 242644 its reverse (446242), we get a palindrome (688886).

The spelling of 242644 in words is "two hundred forty-two thousand, six hundred forty-four".