18328573 has 2 divisors, whose sum is σ = 18328574. Its totient is φ = 18328572.

The previous prime is 18328549. The next prime is 18328577. The reversal of 18328573 is 37582381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 2152089 = 4022^2 + 1467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18328573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18328577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164286 + 9164287.

It is an arithmetic number, because the mean of its divisors is an integer number (9164287).

Almost surely, 2^18328573 is an apocalyptic number.

It is an amenable number.

18328573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328573 is an equidigital number, since it uses as much as digits as its factorization.

18328573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 18328573 is about 4281.1882696280. The cubic root of 18328573 is about 263.6591723970.

The spelling of 18328573 in words is "eighteen million, three hundred twenty-eight thousand, five hundred seventy-three".