8721443 has 2 divisors, whose sum is σ = 8721444. Its totient is φ = 8721442.

The previous prime is 8721413. The next prime is 8721467. The reversal of 8721443 is 3441278.

8721443 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8721443 - 2⁶ = 8721379 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8721403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360721 + 4360722.

It is an arithmetic number, because the mean of its divisors is an integer number (4360722).

Almost surely, 2^8721443 is an apocalyptic number.

8721443 is a deficient number, since it is larger than the sum of its proper divisors (1).

8721443 is an equidigital number, since it uses as much as digits as its factorization.

8721443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 8721443 is about 2953.2089326697. The cubic root of 8721443 is about 205.8398463011.

The spelling of 8721443 in words is "eight million, seven hundred twenty-one thousand, four hundred forty-three".