243605 has 8 divisors (see below), whose sum is σ = 296352. Its totient is φ = 192208.

The previous prime is 243589. The next prime is 243613. The reversal of 243605 is 506342.

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 243605 - 2⁴ = 243589 is a prime.

It is a Duffinian number.

It is a Curzon 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 243605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122 + ... + 708.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2²⁴³⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

243605 is a deficient number, since it is larger than the sum of its proper divisors (52747).

243605 is an equidigital number, since it uses as much as digits as its factorization.

243605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 243605 is about 493.5635723997. The cubic root of 243605 is about 62.4542598669.

Adding to 243605 its reverse (506342), we get a palindrome (749947).

It can be divided in two parts, 243 and 605, that added together give a palindrome (848).

The spelling of 243605 in words is "two hundred forty-three thousand, six hundred five".