423401243 has 2 divisors, whose sum is σ = 423401244. Its totient is φ = 423401242.

The previous prime is 423401233. The next prime is 423401257. The reversal of 423401243 is 342104324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423401243 - 2¹⁸ = 423139099 is a prime.

It is a super-2 number, since 2×423401243² = 358537225147890098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423401233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211700621 + 211700622.

It is an arithmetic number, because the mean of its divisors is an integer number (211700622).

Almost surely, 2^423401243 is an apocalyptic number.

423401243 is a deficient number, since it is larger than the sum of its proper divisors (1).

423401243 is an equidigital number, since it uses as much as digits as its factorization.

423401243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 423401243 is about 20576.7160402237. The cubic root of 423401243 is about 750.9033518002.

Adding to 423401243 its reverse (342104324), we get a palindrome (765505567).

The spelling of 423401243 in words is "four hundred twenty-three million, four hundred one thousand, two hundred forty-three".