242605 has 12 divisors (see below), whose sum is σ = 320796. Its totient is φ = 176000.

The previous prime is 242603. The next prime is 242617. The reversal of 242605 is 506242.

It can be written as a sum of positive squares in 2 ways, for example, as 184041 + 58564 = 429^2 + 242^2 .

It is not a de Polignac number, because 242605 - 2¹ = 242603 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 (242603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405 + ... + 805.

It is an arithmetic number, because the mean of its divisors is an integer number (26733).

2²⁴²⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

242605 is a deficient number, since it is larger than the sum of its proper divisors (78191).

242605 is a wasteful number, since it uses less digits than its factorization.

242605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 242605 is about 492.5494898992. The cubic root of 242605 is about 62.3686842922.

Adding to 242605 its reverse (506242), we get a palindrome (748847).

The spelling of 242605 in words is "two hundred forty-two thousand, six hundred five".