18349187 has 2 divisors, whose sum is σ = 18349188. Its totient is φ = 18349186.

The previous prime is 18349157. The next prime is 18349211. The reversal of 18349187 is 78194381.

It is a strong prime.

It is an emirp because it is prime and its reverse (78194381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18349187 - 2¹⁰ = 18348163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18349127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9174593 + 9174594.

It is an arithmetic number, because the mean of its divisors is an integer number (9174594).

Almost surely, 2^18349187 is an apocalyptic number.

18349187 is a deficient number, since it is larger than the sum of its proper divisors (1).

18349187 is an equidigital number, since it uses as much as digits as its factorization.

18349187 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 18349187 is about 4283.5951022476. The cubic root of 18349187 is about 263.7579804867.

The spelling of 18349187 in words is "eighteen million, three hundred forty-nine thousand, one hundred eighty-seven".