18814643 has 2 divisors, whose sum is σ = 18814644. Its totient is φ = 18814642.

The previous prime is 18814633. The next prime is 18814651. The reversal of 18814643 is 34641881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18814643 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18814633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407321 + 9407322.

It is an arithmetic number, because the mean of its divisors is an integer number (9407322).

Almost surely, 2^18814643 is an apocalyptic number.

18814643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18814643 is an equidigital number, since it uses as much as digits as its factorization.

18814643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 35.

The square root of 18814643 is about 4337.5849271225. The cubic root of 18814643 is about 265.9695962763.

The spelling of 18814643 in words is "eighteen million, eight hundred fourteen thousand, six hundred forty-three".