18684943 has 2 divisors, whose sum is σ = 18684944. Its totient is φ = 18684942.

The previous prime is 18684917. The next prime is 18684949. The reversal of 18684943 is 34948681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18684943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18684943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18684949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342471 + 9342472.

It is an arithmetic number, because the mean of its divisors is an integer number (9342472).

Almost surely, 2^18684943 is an apocalyptic number.

18684943 is a deficient number, since it is larger than the sum of its proper divisors (1).

18684943 is an equidigital number, since it uses as much as digits as its factorization.

18684943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 18684943 is about 4322.6083560739. The cubic root of 18684943 is about 265.3570267822.

The spelling of 18684943 in words is "eighteen million, six hundred eighty-four thousand, nine hundred forty-three".