423644489 has 2 divisors, whose sum is σ = 423644490. Its totient is φ = 423644488.

The previous prime is 423644467. The next prime is 423644519. The reversal of 423644489 is 984446324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239228089 + 184416400 = 15467^2 + 13580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423644489 is a prime.

It is a super-2 number, since 2×423644489² = 358949306120142242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (423644989) 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 as a sum of consecutive naturals, namely, 211822244 + 211822245.

It is an arithmetic number, because the mean of its divisors is an integer number (211822245).

Almost surely, 2^423644489 is an apocalyptic number.

It is an amenable number.

423644489 is a deficient number, since it is larger than the sum of its proper divisors (1).

423644489 is an equidigital number, since it uses as much as digits as its factorization.

423644489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 44.

The square root of 423644489 is about 20582.6259014733. The cubic root of 423644489 is about 751.0471234370.

The spelling of 423644489 in words is "four hundred twenty-three million, six hundred forty-four thousand, four hundred eighty-nine".