423440243 has 2 divisors, whose sum is σ = 423440244. Its totient is φ = 423440242.

The previous prime is 423440231. The next prime is 423440261. The reversal of 423440243 is 342044324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423440243 - 2¹⁸ = 423178099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423440203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211720121 + 211720122.

It is an arithmetic number, because the mean of its divisors is an integer number (211720122).

Almost surely, 2^423440243 is an apocalyptic number.

423440243 is a deficient number, since it is larger than the sum of its proper divisors (1).

423440243 is an equidigital number, since it uses as much as digits as its factorization.

423440243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 26.

The square root of 423440243 is about 20577.6636914884. The cubic root of 423440243 is about 750.9264066306.

Adding to 423440243 its reverse (342044324), we get a palindrome (765484567).

The spelling of 423440243 in words is "four hundred twenty-three million, four hundred forty thousand, two hundred forty-three".