8397221 has 12 divisors (see below), whose sum is σ = 10131552. Its totient is φ = 6816744.

The previous prime is 8397217. The next prime is 8397223. The reversal of 8397221 is 1227938.

It is not a de Polignac number, because 8397221 - 2² = 8397217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8397223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 866 + ... + 4188.

It is an arithmetic number, because the mean of its divisors is an integer number (844296).

Almost surely, 2^8397221 is an apocalyptic number.

It is an amenable number.

8397221 is a deficient number, since it is larger than the sum of its proper divisors (1734331).

8397221 is a wasteful number, since it uses less digits than its factorization.

8397221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368 (or 3349 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 8397221 is about 2897.7958865317. The cubic root of 8397221 is about 203.2568517041.

The spelling of 8397221 in words is "eight million, three hundred ninety-seven thousand, two hundred twenty-one".