18384109 has 2 divisors, whose sum is σ = 18384110. Its totient is φ = 18384108.

The previous prime is 18384073. The next prime is 18384127. The reversal of 18384109 is 90148381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 2022084 = 4045^2 + 1422^2 .

It is a cyclic number.

It is not a de Polignac number, because 18384109 - 2⁹ = 18383597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18364109) 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 as a sum of consecutive naturals, namely, 9192054 + 9192055.

It is an arithmetic number, because the mean of its divisors is an integer number (9192055).

Almost surely, 2^18384109 is an apocalyptic number.

It is an amenable number.

18384109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18384109 is an equidigital number, since it uses as much as digits as its factorization.

18384109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18384109 is about 4287.6694135626. The cubic root of 18384109 is about 263.9252016823.

The spelling of 18384109 in words is "eighteen million, three hundred eighty-four thousand, one hundred nine".