18214247 has 2 divisors, whose sum is σ = 18214248. Its totient is φ = 18214246.

The previous prime is 18214243. The next prime is 18214277. The reversal of 18214247 is 74241281.

It is a weak prime.

It is an emirp because it is prime and its reverse (74241281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18214247 - 2² = 18214243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18214243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107123 + 9107124.

It is an arithmetic number, because the mean of its divisors is an integer number (9107124).

Almost surely, 2^18214247 is an apocalyptic number.

18214247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18214247 is an equidigital number, since it uses as much as digits as its factorization.

18214247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 29.

The square root of 18214247 is about 4267.8152490472. The cubic root of 18214247 is about 263.1098299396.

The spelling of 18214247 in words is "eighteen million, two hundred fourteen thousand, two hundred forty-seven".