243855 has 12 divisors (see below), whose sum is σ = 422760. Its totient is φ = 130032.

The previous prime is 243851. The next prime is 243857. The reversal of 243855 is 558342.

It is not a de Polignac number, because 243855 - 2² = 243851 is a prime.

It is a super-2 number, since 2×243855² = 118930522050, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243855.

It is not an unprimeable number, because it can be changed into a prime (243851) 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 11 ways as a sum of consecutive naturals, for example, 2665 + ... + 2754.

It is an arithmetic number, because the mean of its divisors is an integer number (35230).

2²⁴³⁸⁵⁵ is an apocalyptic number.

243855 is a deficient number, since it is larger than the sum of its proper divisors (178905).

243855 is a wasteful number, since it uses less digits than its factorization.

243855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430 (or 5427 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 243855 is about 493.8167676376. The cubic root of 243855 is about 62.4756171555.

The spelling of 243855 in words is "two hundred forty-three thousand, eight hundred fifty-five".