18198247 has 2 divisors, whose sum is σ = 18198248. Its totient is φ = 18198246.

The previous prime is 18198217. The next prime is 18198251. The reversal of 18198247 is 74289181.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74289181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18198247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18198217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099123 + 9099124.

It is an arithmetic number, because the mean of its divisors is an integer number (9099124).

Almost surely, 2^18198247 is an apocalyptic number.

18198247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198247 is an equidigital number, since it uses as much as digits as its factorization.

18198247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 18198247 is about 4265.9403418238. The cubic root of 18198247 is about 263.0327658965.

The spelling of 18198247 in words is "eighteen million, one hundred ninety-eight thousand, two hundred forty-seven".