43320643 has 2 divisors, whose sum is σ = 43320644. Its totient is φ = 43320642.

The previous prime is 43320637. The next prime is 43320653. The reversal of 43320643 is 34602334.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43320643 is a prime.

It is equal to p_2622760 and since 43320643 and 2622760 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43320623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21660321 + 21660322.

It is an arithmetic number, because the mean of its divisors is an integer number (21660322).

Almost surely, 2^43320643 is an apocalyptic number.

43320643 is a deficient number, since it is larger than the sum of its proper divisors (1).

43320643 is an equidigital number, since it uses as much as digits as its factorization.

43320643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 25.

The square root of 43320643 is about 6581.8419154519. The cubic root of 43320643 is about 351.2084567324.

Adding to 43320643 its reverse (34602334), we get a palindrome (77922977).

The spelling of 43320643 in words is "forty-three million, three hundred twenty thousand, six hundred forty-three".