623643443 has 4 divisors (see below), whose sum is σ = 633867168. Its totient is φ = 613419720.

The previous prime is 623643359. The next prime is 623643529. The reversal of 623643443 is 344346326.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 623643443 - 2¹⁶ = 623577907 is a prime.

It is a super-2 number, since 2×623643443² = 777862287993788498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623645443) 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 3 ways as a sum of consecutive naturals, for example, 5111771 + ... + 5111892.

It is an arithmetic number, because the mean of its divisors is an integer number (158466792).

Almost surely, 2^623643443 is an apocalyptic number.

623643443 is a deficient number, since it is larger than the sum of its proper divisors (10223725).

623643443 is a wasteful number, since it uses less digits than its factorization.

623643443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10223724.

The product of its digits is 124416, while the sum is 35.

The square root of 623643443 is about 24972.8541220262. The cubic root of 623643443 is about 854.3689439654.

Adding to 623643443 its reverse (344346326), we get a palindrome (967989769).

The spelling of 623643443 in words is "six hundred twenty-three million, six hundred forty-three thousand, four hundred forty-three".