242865 has 32 divisors (see below), whose sum is σ = 495360. Its totient is φ = 110592.

The previous prime is 242863. The next prime is 242867. The reversal of 242865 is 568242.

It is an interprime number because it is at equal distance from previous prime (242863) and next prime (242867).

It is not a de Polignac number, because 242865 - 2¹ = 242863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

242865 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 242865.

It is not an unprimeable number, because it can be changed into a prime (242863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 817 + ... + 1073.

It is an arithmetic number, because the mean of its divisors is an integer number (15480).

2²⁴²⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

242865 is an abundant number, since it is smaller than the sum of its proper divisors (252495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

242865 is a wasteful number, since it uses less digits than its factorization.

242865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 272 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 242865 is about 492.8133520918. The cubic root of 242865 is about 62.3909565297.

The spelling of 242865 in words is "two hundred forty-two thousand, eight hundred sixty-five".