18187349 has 2 divisors, whose sum is σ = 18187350. Its totient is φ = 18187348.

The previous prime is 18187327. The next prime is 18187357. The reversal of 18187349 is 94378181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 5726449 = 3530^2 + 2393^2 .

It is a cyclic number.

It is not a de Polignac number, because 18187349 - 2²⁰ = 17138773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18187369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093674 + 9093675.

It is an arithmetic number, because the mean of its divisors is an integer number (9093675).

Almost surely, 2^18187349 is an apocalyptic number.

It is an amenable number.

18187349 is a deficient number, since it is larger than the sum of its proper divisors (1).

18187349 is an equidigital number, since it uses as much as digits as its factorization.

18187349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18187349 is about 4264.6628237177. The cubic root of 18187349 is about 262.9802497855.

The spelling of 18187349 in words is "eighteen million, one hundred eighty-seven thousand, three hundred forty-nine".