242815 has 4 divisors (see below), whose sum is σ = 291384. Its totient is φ = 194248.

The previous prime is 242813. The next prime is 242819. The reversal of 242815 is 518242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518242 = 2 ⋅259121.

It is a cyclic number.

It is not a de Polignac number, because 242815 - 2¹ = 242813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24277 + ... + 24286.

It is an arithmetic number, because the mean of its divisors is an integer number (72846).

2²⁴²⁸¹⁵ is an apocalyptic number.

242815 is a deficient number, since it is larger than the sum of its proper divisors (48569).

242815 is an equidigital number, since it uses as much as digits as its factorization.

242815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48568.

The product of its digits is 640, while the sum is 22.

The square root of 242815 is about 492.7626203356. The cubic root of 242815 is about 62.3866746420.

The spelling of 242815 in words is "two hundred forty-two thousand, eight hundred fifteen".