18247312 has 20 divisors (see below), whose sum is σ = 35420476. Its totient is φ = 9106560.

The previous prime is 18247309. The next prime is 18247319. The reversal of 18247312 is 21374281.

It can be written as a sum of positive squares in 2 ways, for example, as 4822416 + 13424896 = 2196^2 + 3664^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18247319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15778 + ... + 16894.

Almost surely, 2^18247312 is an apocalyptic number.

It is an amenable number.

18247312 is a deficient number, since it is larger than the sum of its proper divisors (17173164).

18247312 is a wasteful number, since it uses less digits than its factorization.

18247312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146 (or 2140 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 18247312 is about 4271.6872544698. The cubic root of 18247312 is about 263.2689447160.

The spelling of 18247312 in words is "eighteen million, two hundred forty-seven thousand, three hundred twelve".