18840043 has 2 divisors, whose sum is σ = 18840044. Its totient is φ = 18840042.

The previous prime is 18840037. The next prime is 18840071. The reversal of 18840043 is 34004881.

It is an a-pointer prime, because the next prime (18840071) can be obtained adding 18840043 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18840043 - 2⁵ = 18840011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18839993 and 18840020.

It is not a weakly prime, because it can be changed into another prime (18840023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9420021 + 9420022.

It is an arithmetic number, because the mean of its divisors is an integer number (9420022).

Almost surely, 2^18840043 is an apocalyptic number.

18840043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18840043 is an equidigital number, since it uses as much as digits as its factorization.

18840043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18840043 is about 4340.5118361778. The cubic root of 18840043 is about 266.0892298681.

The spelling of 18840043 in words is "eighteen million, eight hundred forty thousand, forty-three".