7223661 has 20 divisors (see below), whose sum is σ = 10864832. Its totient is φ = 4802652.

The previous prime is 7223659. The next prime is 7223683. The reversal of 7223661 is 1663227.

It is a happy number.

It is not a de Polignac number, because 7223661 - 2¹ = 7223659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7223641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19500 + ... + 19866.

Almost surely, 2^7223661 is an apocalyptic number.

It is an amenable number.

7223661 is a deficient number, since it is larger than the sum of its proper divisors (3641171).

7223661 is an frugal number, since it uses more digits than its factorization.

7223661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 370 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 7223661 is about 2687.6869237320. The cubic root of 7223661 is about 193.3091682705.

Adding to 7223661 its reverse (1663227), we get a palindrome (8886888).

The spelling of 7223661 in words is "seven million, two hundred twenty-three thousand, six hundred sixty-one".