18223316 has 6 divisors (see below), whose sum is σ = 31890810. Its totient is φ = 9111656.

The previous prime is 18223313. The next prime is 18223321. The reversal of 18223316 is 61332281.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 8008900 = 3196^2 + 2830^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277911 + ... + 2277918.

It is an arithmetic number, because the mean of its divisors is an integer number (5315135).

Almost surely, 2^18223316 is an apocalyptic number.

It is an amenable number.

18223316 is a deficient number, since it is larger than the sum of its proper divisors (13667494).

18223316 is a wasteful number, since it uses less digits than its factorization.

18223316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555833 (or 4555831 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 18223316 is about 4268.8776042421. The cubic root of 18223316 is about 263.1534907642.

Adding to 18223316 its reverse (61332281), we get a palindrome (79555597).

The spelling of 18223316 in words is "eighteen million, two hundred twenty-three thousand, three hundred sixteen".