8221418 has 4 divisors (see below), whose sum is σ = 12332130. Its totient is φ = 4110708.

The previous prime is 8221403. The next prime is 8221427. The reversal of 8221418 is 8141228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8196769 + 24649 = 2863^2 + 157^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2055353 + ... + 2055356.

Almost surely, 2^8221418 is an apocalyptic number.

8221418 is a deficient number, since it is larger than the sum of its proper divisors (4110712).

8221418 is a wasteful number, since it uses less digits than its factorization.

8221418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110711.

The product of its digits is 1024, while the sum is 26.

The square root of 8221418 is about 2867.3015188501. The cubic root of 8221418 is about 201.8283841220.

The spelling of 8221418 in words is "eight million, two hundred twenty-one thousand, four hundred eighteen".