8744221 has 4 divisors (see below), whose sum is σ = 8751712. Its totient is φ = 8736732.

The previous prime is 8744207. The next prime is 8744227. The reversal of 8744221 is 1224478.

8744221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8744221 - 2⁵ = 8744189 is a prime.

It is a super-2 number, since 2×8744221² = 152922801793682, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 8744221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8744227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1575 + ... + 4468.

It is an arithmetic number, because the mean of its divisors is an integer number (2187928).

Almost surely, 2^8744221 is an apocalyptic number.

It is an amenable number.

8744221 is a deficient number, since it is larger than the sum of its proper divisors (7491).

8744221 is a wasteful number, since it uses less digits than its factorization.

8744221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490.

The product of its digits is 3584, while the sum is 28.

The square root of 8744221 is about 2957.0629009204. The cubic root of 8744221 is about 206.0188894609.

Adding to 8744221 its reverse (1224478), we get a palindrome (9968699).

The spelling of 8744221 in words is "eight million, seven hundred forty-four thousand, two hundred twenty-one".