243858 has 16 divisors (see below), whose sum is σ = 493920. Its totient is φ = 80256.

The previous prime is 243857. The next prime is 243863. The reversal of 243858 is 858342.

243858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243858.

It is not an unprimeable number, because it can be changed into a prime (243851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373 + ... + 791.

It is an arithmetic number, because the mean of its divisors is an integer number (30870).

2²⁴³⁸⁵⁸ is an apocalyptic number.

243858 is an abundant number, since it is smaller than the sum of its proper divisors (250062).

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

243858 is a wasteful number, since it uses less digits than its factorization.

243858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its digits is 7680, while the sum is 30.

The square root of 243858 is about 493.8198051921. The cubic root of 243858 is about 62.4758733543.

The spelling of 243858 in words is "two hundred forty-three thousand, eight hundred fifty-eight".