243003 has 4 divisors (see below), whose sum is σ = 324008. Its totient is φ = 162000.

The previous prime is 242999. The next prime is 243011. The reversal of 243003 is 300342.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 243003 - 2² = 242999 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 243003.

It is not an unprimeable number, because it can be changed into a prime (243073) 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, 40498 + ... + 40503.

It is an arithmetic number, because the mean of its divisors is an integer number (81002).

2²⁴³⁰⁰³ is an apocalyptic number.

243003 is a deficient number, since it is larger than the sum of its proper divisors (81005).

243003 is an equidigital number, since it uses as much as digits as its factorization.

243003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81004.

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 243003 is about 492.9533446484. The cubic root of 243003 is about 62.4027714910.

Adding to 243003 its reverse (300342), we get a palindrome (543345).

It can be divided in two parts, 24300 and 3, that multiplied together give a square (72900 = 270²).

The spelling of 243003 in words is "two hundred forty-three thousand, three", and thus it is an iban number.