243859 has 8 divisors (see below), whose sum is σ = 304128. Its totient is φ = 189960.

The previous prime is 243857. The next prime is 243863. The reversal of 243859 is 958342.

243859 is nontrivially palindromic in base 15.

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 243859 - 2¹ = 243857 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 243859.

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, 1507 + ... + 1660.

It is an arithmetic number, because the mean of its divisors is an integer number (38016).

2²⁴³⁸⁵⁹ is an apocalyptic number.

243859 is a deficient number, since it is larger than the sum of its proper divisors (60269).

243859 is a wasteful number, since it uses less digits than its factorization.

243859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185.

The product of its digits is 8640, while the sum is 31.

The square root of 243859 is about 493.8208177062. The cubic root of 243859 is about 62.4759587535.

It can be divided in two parts, 24 and 3859, that added together give a palindrome (3883).

The spelling of 243859 in words is "two hundred forty-three thousand, eight hundred fifty-nine".