243493 has 4 divisors (see below), whose sum is σ = 247680. Its totient is φ = 239308.

The previous prime is 243487. The next prime is 243517. The reversal of 243493 is 394342.

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 243493 - 2⁵ = 243461 is a prime.

It is a d-powerful number, because it can be written as 2³ + 4³ + 4⁸ + 3⁶ + 9 + 3¹¹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2005 + ... + 2122.

It is an arithmetic number, because the mean of its divisors is an integer number (61920).

2²⁴³⁴⁹³ is an apocalyptic number.

It is an amenable number.

243493 is a deficient number, since it is larger than the sum of its proper divisors (4187).

243493 is an equidigital number, since it uses as much as digits as its factorization.

243493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186.

The product of its digits is 2592, while the sum is 25.

The square root of 243493 is about 493.4500987942. The cubic root of 243493 is about 62.4446870621. Note that the first 3 decimals are identical.

The spelling of 243493 in words is "two hundred forty-three thousand, four hundred ninety-three".