18918043 has 2 divisors, whose sum is σ = 18918044. Its totient is φ = 18918042.

The previous prime is 18918019. The next prime is 18918071. The reversal of 18918043 is 34081981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18918043 - 2⁹ = 18917531 is a prime.

It is not a weakly prime, because it can be changed into another prime (18918013) 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, 9459021 + 9459022.

It is an arithmetic number, because the mean of its divisors is an integer number (9459022).

Almost surely, 2^18918043 is an apocalyptic number.

18918043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18918043 is an equidigital number, since it uses as much as digits as its factorization.

18918043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18918043 is about 4349.4876709792. The cubic root of 18918043 is about 266.4559378593.

The spelling of 18918043 in words is "eighteen million, nine hundred eighteen thousand, forty-three".