8443621 has 2 divisors, whose sum is σ = 8443622. Its totient is φ = 8443620.

The previous prime is 8443613. The next prime is 8443627. The reversal of 8443621 is 1263448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 3204100 = 2289^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 8443621 - 2³ = 8443613 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8443621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8443627) 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, 4221810 + 4221811.

It is an arithmetic number, because the mean of its divisors is an integer number (4221811).

Almost surely, 2^8443621 is an apocalyptic number.

It is an amenable number.

8443621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8443621 is an equidigital number, since it uses as much as digits as its factorization.

8443621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 28.

The square root of 8443621 is about 2905.7909422393. The cubic root of 8443621 is about 203.6305388270.

It can be divided in two parts, 844 and 3621, that added together give a triangular number (4465 = T₉₄).

The spelling of 8443621 in words is "eight million, four hundred forty-three thousand, six hundred twenty-one".