18916243 has 2 divisors, whose sum is σ = 18916244. Its totient is φ = 18916242.

The previous prime is 18916241. The next prime is 18916253. The reversal of 18916243 is 34261981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18916243 - 2¹ = 18916241 is a prime.

Together with 18916241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18916199 and 18916208.

It is not a weakly prime, because it can be changed into another prime (18916241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458121 + 9458122.

It is an arithmetic number, because the mean of its divisors is an integer number (9458122).

Almost surely, 2^18916243 is an apocalyptic number.

18916243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916243 is an equidigital number, since it uses as much as digits as its factorization.

18916243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 18916243 is about 4349.2807451348. The cubic root of 18916243 is about 266.4474867402.

The spelling of 18916243 in words is "eighteen million, nine hundred sixteen thousand, two hundred forty-three".