7221994 has 16 divisors (see below), whose sum is σ = 11801160. Its totient is φ = 3294720.

The previous prime is 7221983. The next prime is 7222001. The reversal of 7221994 is 4991227.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1292769 + 5929225 = 1137^2 + 2435^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754 + ... + 3874.

Almost surely, 2^7221994 is an apocalyptic number.

7221994 is a deficient number, since it is larger than the sum of its proper divisors (4579166).

7221994 is a wasteful number, since it uses less digits than its factorization.

7221994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3225.

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

The square root of 7221994 is about 2687.3767878733. The cubic root of 7221994 is about 193.2942971788.

The spelling of 7221994 in words is "seven million, two hundred twenty-one thousand, nine hundred ninety-four".