18223144 has 16 divisors (see below), whose sum is σ = 34650720. Its totient is φ = 8982960.

The previous prime is 18223141. The next prime is 18223157. The reversal of 18223144 is 44132281.

It is not an unprimeable number, because it can be changed into a prime (18223141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15474 + ... + 16609.

It is an arithmetic number, because the mean of its divisors is an integer number (2165670).

Almost surely, 2^18223144 is an apocalyptic number.

It is an amenable number.

18223144 is a deficient number, since it is larger than the sum of its proper divisors (16427576).

18223144 is a wasteful number, since it uses less digits than its factorization.

18223144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32160 (or 32156 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 18223144 is about 4268.8574583839. The cubic root of 18223144 is about 263.1526628405.

The spelling of 18223144 in words is "eighteen million, two hundred twenty-three thousand, one hundred forty-four".