243400043 has 2 divisors, whose sum is σ = 243400044. Its totient is φ = 243400042.

The previous prime is 243399997. The next prime is 243400057. The reversal of 243400043 is 340004342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243400043 - 2⁶ = 243399979 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 243399988 and 243400024.

It is not a weakly prime, because it can be changed into another prime (243402043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700021 + 121700022.

It is an arithmetic number, because the mean of its divisors is an integer number (121700022).

Almost surely, 2^243400043 is an apocalyptic number.

243400043 is a deficient number, since it is larger than the sum of its proper divisors (1).

243400043 is an equidigital number, since it uses as much as digits as its factorization.

243400043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 243400043 is about 15601.2833766969. The cubic root of 243400043 is about 624.3673966101.

Adding to 243400043 its reverse (340004342), we get a palindrome (583404385).

The spelling of 243400043 in words is "two hundred forty-three million, four hundred thousand, forty-three".