242842 has 4 divisors (see below), whose sum is σ = 364266. Its totient is φ = 121420.

The previous prime is 242819. The next prime is 242863. The reversal of 242842 is 248242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248242 = 2 ⋅124121.

It can be written as a sum of positive squares in only one way, i.e., 239121 + 3721 = 489^2 + 61^2 .

It is an unprimeable number.

242842 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60709 + ... + 60712.

2²⁴²⁸⁴² is an apocalyptic number.

242842 is a deficient number, since it is larger than the sum of its proper divisors (121424).

242842 is a wasteful number, since it uses less digits than its factorization.

242842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121423.

The product of its digits is 1024, while the sum is 22.

The square root of 242842 is about 492.7900161326. The cubic root of 242842 is about 62.3889869343.

The spelling of 242842 in words is "two hundred forty-two thousand, eight hundred forty-two".