243599 has 4 divisors (see below), whose sum is σ = 256440. Its totient is φ = 230760.

The previous prime is 243589. The next prime is 243613. The reversal of 243599 is 995342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 995342 = 2 ⋅497671.

It is a cyclic number.

It is not a de Polignac number, because 243599 - 2⁴ = 243583 is a prime.

It is a Duffinian number.

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 243599.

It is not an unprimeable number, because it can be changed into a prime (243539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6392 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (64110).

2²⁴³⁵⁹⁹ is an apocalyptic number.

243599 is a deficient number, since it is larger than the sum of its proper divisors (12841).

243599 is a wasteful number, since it uses less digits than its factorization.

243599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12840.

The product of its digits is 9720, while the sum is 32.

The square root of 243599 is about 493.5574941180. The cubic root of 243599 is about 62.4537471125.

The spelling of 243599 in words is "two hundred forty-three thousand, five hundred ninety-nine".