18504193 has 2 divisors, whose sum is σ = 18504194. Its totient is φ = 18504192.

The previous prime is 18504169. The next prime is 18504197. The reversal of 18504193 is 39140581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 288369 = 4268^2 + 537^2 .

It is an emirp because it is prime and its reverse (39140581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18504193 is a prime.

It is not a weakly prime, because it can be changed into another prime (18504197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252096 + 9252097.

It is an arithmetic number, because the mean of its divisors is an integer number (9252097).

Almost surely, 2^18504193 is an apocalyptic number.

It is an amenable number.

18504193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18504193 is an equidigital number, since it uses as much as digits as its factorization.

18504193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 18504193 is about 4301.6500322551. The cubic root of 18504193 is about 264.4986033662.

The spelling of 18504193 in words is "eighteen million, five hundred four thousand, one hundred ninety-three".