243242 has 4 divisors (see below), whose sum is σ = 364866. Its totient is φ = 121620.

The previous prime is 243239. The next prime is 243259. The reversal of 243242 is 242342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242342 = 2 ⋅121171.

It can be written as a sum of positive squares in only one way, i.e., 231361 + 11881 = 481^2 + 109^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60809 + ... + 60812.

2²⁴³²⁴² is an apocalyptic number.

243242 is a deficient number, since it is larger than the sum of its proper divisors (121624).

243242 is a wasteful number, since it uses less digits than its factorization.

243242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121623.

The product of its digits is 384, while the sum is 17.

The square root of 243242 is about 493.1957015222. The cubic root of 243242 is about 62.4232230568.

Adding to 243242 its reverse (242342), we get a palindrome (485584).

Subtracting from 243242 its reverse (242342), we obtain a square (900 = 30²).

The spelling of 243242 in words is "two hundred forty-three thousand, two hundred forty-two", and thus it is an iban number.