18814247 has 2 divisors, whose sum is σ = 18814248. Its totient is φ = 18814246.

The previous prime is 18814193. The next prime is 18814249. The reversal of 18814247 is 74241881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18814247 - 2⁶ = 18814183 is a prime.

Together with 18814249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18814249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407123 + 9407124.

It is an arithmetic number, because the mean of its divisors is an integer number (9407124).

Almost surely, 2^18814247 is an apocalyptic number.

18814247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18814247 is an equidigital number, since it uses as much as digits as its factorization.

18814247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 35.

The square root of 18814247 is about 4337.5392793611. The cubic root of 18814247 is about 265.9677302705.

The spelling of 18814247 in words is "eighteen million, eight hundred fourteen thousand, two hundred forty-seven".