18386149 has 2 divisors, whose sum is σ = 18386150. Its totient is φ = 18386148.

The previous prime is 18386107. The next prime is 18386183. The reversal of 18386149 is 94168381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 50625 = 4282^2 + 225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18386149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18386189) 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, 9193074 + 9193075.

It is an arithmetic number, because the mean of its divisors is an integer number (9193075).

Almost surely, 2^18386149 is an apocalyptic number.

It is an amenable number.

18386149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18386149 is an equidigital number, since it uses as much as digits as its factorization.

18386149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 18386149 is about 4287.9072984382. The cubic root of 18386149 is about 263.9349635097.

The spelling of 18386149 in words is "eighteen million, three hundred eighty-six thousand, one hundred forty-nine".