242805 has 8 divisors (see below), whose sum is σ = 388512. Its totient is φ = 129488.

The previous prime is 242797. The next prime is 242807. The reversal of 242805 is 508242.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 242805 - 2³ = 242797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242807) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8079 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (48564).

2²⁴²⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

242805 is a deficient number, since it is larger than the sum of its proper divisors (145707).

242805 is a wasteful number, since it uses less digits than its factorization.

242805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16195.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 242805 is about 492.7524733576. The cubic root of 242805 is about 62.3858181939.

Multiplying 242805 by its sum of digits (21), we get a palindrome (5098905).

The spelling of 242805 in words is "two hundred forty-two thousand, eight hundred five".