242855 has 4 divisors (see below), whose sum is σ = 291432. Its totient is φ = 194280.

The previous prime is 242819. The next prime is 242863. The reversal of 242855 is 558242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558242 = 2 ⋅279121.

It is not a de Polignac number, because 242855 - 2¹² = 238759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 24281 + ... + 24290.

It is an arithmetic number, because the mean of its divisors is an integer number (72858).

2²⁴²⁸⁵⁵ is an apocalyptic number.

242855 is a deficient number, since it is larger than the sum of its proper divisors (48577).

242855 is an equidigital number, since it uses as much as digits as its factorization.

242855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48576.

The product of its digits is 3200, while the sum is 26.

The square root of 242855 is about 492.8032061584. The cubic root of 242855 is about 62.3901001991.

The spelling of 242855 in words is "two hundred forty-two thousand, eight hundred fifty-five".