423644643 has 12 divisors (see below), whose sum is σ = 626162680. Its totient is φ = 275861376.

The previous prime is 423644633. The next prime is 423644647. The reversal of 423644643 is 346446324.

423644643 is a `hidden beast` number, since 4 + 2 + 3 + 6 + 4 + 4 + 643 = 666.

It is not a de Polignac number, because 423644643 - 2⁶ = 423644579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423644598 and 423644607.

It is not an unprimeable number, because it can be changed into a prime (423644647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546958 + ... + 547731.

Almost surely, 2^423644643 is an apocalyptic number.

423644643 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

423644643 is a deficient number, since it is larger than the sum of its proper divisors (202518037).

423644643 is a wasteful number, since it uses less digits than its factorization.

423644643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094738 (or 1094735 counting only the distinct ones).

The product of its digits is 165888, while the sum is 36.

The square root of 423644643 is about 20582.6296424922. The cubic root of 423644643 is about 751.0472144420.

The spelling of 423644643 in words is "four hundred twenty-three million, six hundred forty-four thousand, six hundred forty-three".