243340043 has 4 divisors (see below), whose sum is σ = 249275208. Its totient is φ = 237404880.

The previous prime is 243340021. The next prime is 243340063. The reversal of 243340043 is 340043342.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 243340043 - 2⁶ = 243339979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243340003) 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, 2967521 + ... + 2967602.

It is an arithmetic number, because the mean of its divisors is an integer number (62318802).

Almost surely, 2^243340043 is an apocalyptic number.

243340043 is a deficient number, since it is larger than the sum of its proper divisors (5935165).

243340043 is an equidigital number, since it uses as much as digits as its factorization.

243340043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5935164.

The product of its (nonzero) digits is 3456, while the sum is 23.

The square root of 243340043 is about 15599.3603394498. The cubic root of 243340043 is about 624.3160885906.

Adding to 243340043 its reverse (340043342), we get a palindrome (583383385).

The spelling of 243340043 in words is "two hundred forty-three million, three hundred forty thousand, forty-three".