18228722 has 6 divisors (see below), whose sum is σ = 27352143. Its totient is φ = 9111342.

The previous prime is 18228703. The next prime is 18228797. The reversal of 18228722 is 22782281.

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 9114361 = 3019^2 + 3019^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3019.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4529 + ... + 7547.

Almost surely, 2^18228722 is an apocalyptic number.

18228722 is a deficient number, since it is larger than the sum of its proper divisors (9123421).

18228722 is an frugal number, since it uses more digits than its factorization.

18228722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040 (or 3021 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 18228722 is about 4269.5107448044. The cubic root of 18228722 is about 263.1795099424.

Multiplying 18228722 by its sum of digits (32), we get a square (583319104 = 24152²).

The spelling of 18228722 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred twenty-two".