4321643 has 2 divisors, whose sum is σ = 4321644. Its totient is φ = 4321642.

The previous prime is 4321633. The next prime is 4321657. The reversal of 4321643 is 3461234.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4321643 - 2⁴ = 4321627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (4321613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2160821 + 2160822.

It is an arithmetic number, because the mean of its divisors is an integer number (2160822).

Almost surely, 2^4321643 is an apocalyptic number.

4321643 is a deficient number, since it is larger than the sum of its proper divisors (1).

4321643 is an equidigital number, since it uses as much as digits as its factorization.

4321643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 4321643 is about 2078.8561758813. The cubic root of 4321643 is about 162.8857015460.

Adding to 4321643 its reverse (3461234), we get a palindrome (7782877).

The spelling of 4321643 in words is "four million, three hundred twenty-one thousand, six hundred forty-three".