8221424 has 10 divisors (see below), whose sum is σ = 15929040. Its totient is φ = 4110704.

The previous prime is 8221403. The next prime is 8221427. The reversal of 8221424 is 4241228.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 8221424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256904 + ... + 256935.

It is an arithmetic number, because the mean of its divisors is an integer number (1592904).

Almost surely, 2^8221424 is an apocalyptic number.

It is an amenable number.

8221424 is a deficient number, since it is larger than the sum of its proper divisors (7707616).

8221424 is a wasteful number, since it uses less digits than its factorization.

8221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513847 (or 513841 counting only the distinct ones).

The product of its digits is 1024, while the sum is 23.

The square root of 8221424 is about 2867.3025651298. The cubic root of 8221424 is about 201.8284332201.

The spelling of 8221424 in words is "eight million, two hundred twenty-one thousand, four hundred twenty-four".