8521224 has 64 divisors (see below), whose sum is σ = 22809600. Its totient is φ = 2646336.

The previous prime is 8521223. The next prime is 8521229. The reversal of 8521224 is 4221258.

It is a super-2 number, since 2×8521224² = 145222516916352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a d-powerful number, because it can be written as 8³ + 5 + 2 + 1 + 2¹⁷ + 2²³ + 4⁵ .

It is a junction number, because it is equal to n+sod(n) for n = 8521194 and 8521203.

It is not an unprimeable number, because it can be changed into a prime (8521223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23557 + ... + 23915.

It is an arithmetic number, because the mean of its divisors is an integer number (356400).

Almost surely, 2^8521224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8521224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11404800).

8521224 is an abundant number, since it is smaller than the sum of its proper divisors (14288376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8521224 is a wasteful number, since it uses less digits than its factorization.

8521224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 430 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 8521224 is about 2919.1135640807. The cubic root of 8521224 is about 204.2524747923.

The spelling of 8521224 in words is "eight million, five hundred twenty-one thousand, two hundred twenty-four".