7991224 has 32 divisors (see below), whose sum is σ = 16120080. Its totient is φ = 3700224.

The previous prime is 7991219. The next prime is 7991231. The reversal of 7991224 is 4221997.

It is a happy number.

It is a super-2 number, since 2×7991224² = 127719322036352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 7991224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8674 + ... + 9550.

Almost surely, 2^7991224 is an apocalyptic number.

It is an amenable number.

7991224 is an abundant number, since it is smaller than the sum of its proper divisors (8128856).

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

7991224 is a wasteful number, since it uses less digits than its factorization.

7991224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967 (or 963 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 7991224 is about 2826.8753067654. The cubic root of 7991224 is about 199.9268399079.

The spelling of 7991224 in words is "seven million, nine hundred ninety-one thousand, two hundred twenty-four".