243403 has 2 divisors, whose sum is σ = 243404. Its totient is φ = 243402.

The previous prime is 243401. The next prime is 243421. The reversal of 243403 is 304342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243403 - 2¹ = 243401 is a prime.

Together with 243401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121701 + 121702.

It is an arithmetic number, because the mean of its divisors is an integer number (121702).

2²⁴³⁴⁰³ is an apocalyptic number.

243403 is a deficient number, since it is larger than the sum of its proper divisors (1).

243403 is an equidigital number, since it uses as much as digits as its factorization.

243403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 243403 is about 493.3588957341. The cubic root of 243403 is about 62.4369925022.

Adding to 243403 its reverse (304342), we get a palindrome (547745).

It can be divided in two parts, 243 and 403, that added together give a palindrome (646).

The spelling of 243403 in words is "two hundred forty-three thousand, four hundred three", and thus it is an iban number.