18746243 has 2 divisors, whose sum is σ = 18746244. Its totient is φ = 18746242.

The previous prime is 18746207. The next prime is 18746249. The reversal of 18746243 is 34264781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18746243 - 2¹⁸ = 18484099 is a prime.

It is not a weakly prime, because it can be changed into another prime (18746249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9373121 + 9373122.

It is an arithmetic number, because the mean of its divisors is an integer number (9373122).

Almost surely, 2^18746243 is an apocalyptic number.

18746243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18746243 is an equidigital number, since it uses as much as digits as its factorization.

18746243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 18746243 is about 4329.6931761962. The cubic root of 18746243 is about 265.6468970737.

The spelling of 18746243 in words is "eighteen million, seven hundred forty-six thousand, two hundred forty-three".