18184409 has 2 divisors, whose sum is σ = 18184410. Its totient is φ = 18184408.

The previous prime is 18184393. The next prime is 18184417. The reversal of 18184409 is 90448181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13344409 + 4840000 = 3653^2 + 2200^2 .

It is an emirp because it is prime and its reverse (90448181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18184409 - 2⁴ = 18184393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18184429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9092204 + 9092205.

It is an arithmetic number, because the mean of its divisors is an integer number (9092205).

Almost surely, 2^18184409 is an apocalyptic number.

It is an amenable number.

18184409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18184409 is an equidigital number, since it uses as much as digits as its factorization.

18184409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18184409 is about 4264.3181166512. The cubic root of 18184409 is about 262.9660786970.

The spelling of 18184409 in words is "eighteen million, one hundred eighty-four thousand, four hundred nine".