243393 has 4 divisors (see below), whose sum is σ = 324528. Its totient is φ = 162260.

The previous prime is 243391. The next prime is 243401. The reversal of 243393 is 393342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243393 - 2¹ = 243391 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (243391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40563 + ... + 40568.

It is an arithmetic number, because the mean of its divisors is an integer number (81132).

2²⁴³³⁹³ is an apocalyptic number.

It is an amenable number.

243393 is a deficient number, since it is larger than the sum of its proper divisors (81135).

243393 is an equidigital number, since it uses as much as digits as its factorization.

243393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81134.

The product of its digits is 1944, while the sum is 24.

The square root of 243393 is about 493.3487610200. The cubic root of 243393 is about 62.4361374341.

It can be divided in two parts, 24339 and 3, that added together give a palindrome (24342).

The spelling of 243393 in words is "two hundred forty-three thousand, three hundred ninety-three".