7223989 has 4 divisors (see below), whose sum is σ = 7230924. Its totient is φ = 7217056.

The previous prime is 7223981. The next prime is 7223999. The reversal of 7223989 is 9893227.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9893227 = 191 ⋅51797.

It can be written as a sum of positive squares in 2 ways, for example, as 2528100 + 4695889 = 1590^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 7223989 - 2³ = 7223981 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

7223989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7223981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1552 + ... + 4105.

It is an arithmetic number, because the mean of its divisors is an integer number (1807731).

Almost surely, 2^7223989 is an apocalyptic number.

It is an amenable number.

7223989 is a deficient number, since it is larger than the sum of its proper divisors (6935).

7223989 is a wasteful number, since it uses less digits than its factorization.

7223989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6934.

The product of its digits is 54432, while the sum is 40.

The square root of 7223989 is about 2687.7479420511. The cubic root of 7223989 is about 193.3120940467.

The spelling of 7223989 in words is "seven million, two hundred twenty-three thousand, nine hundred eighty-nine".