7224540 has 36 divisors (see below), whose sum is σ = 20287176. Its totient is φ = 1920992.

The previous prime is 7224521. The next prime is 7224551. The reversal of 7224540 is 454227.

7224540 = T₅₄₄ + T₅₄₅ + ... + T₅₈₈.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 7224540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20647 + ... + 20993.

Almost surely, 2^7224540 is an apocalyptic number.

It is an amenable number.

7224540 is an abundant number, since it is smaller than the sum of its proper divisors (13062636).

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

7224540 is a wasteful number, since it uses less digits than its factorization.

7224540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 7224540 is about 2687.8504422679. The cubic root of 7224540 is about 193.3170087947.

Adding to 7224540 its reverse (454227), we get a palindrome (7678767).

The spelling of 7224540 in words is "seven million, two hundred twenty-four thousand, five hundred forty".