7521224 has 16 divisors (see below), whose sum is σ = 14152320. Its totient is φ = 3747280.

The previous prime is 7521221. The next prime is 7521229. The reversal of 7521224 is 4221257.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 7521224.

It is not an unprimeable number, because it can be changed into a prime (7521221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^7521224 is an apocalyptic number.

It is an amenable number.

7521224 is a deficient number, since it is larger than the sum of its proper divisors (6631096).

7521224 is a wasteful number, since it uses less digits than its factorization.

7521224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340 (or 3336 counting only the distinct ones).

The product of its digits is 1120, while the sum is 23.

The square root of 7521224 is about 2742.4850045169. The cubic root of 7521224 is about 195.9278507178.

The spelling of 7521224 in words is "seven million, five hundred twenty-one thousand, two hundred twenty-four".