18728023 has 2 divisors, whose sum is σ = 18728024. Its totient is φ = 18728022.

The previous prime is 18728009. The next prime is 18728051. The reversal of 18728023 is 32082781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18728023 - 2⁵ = 18727991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18728063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364011 + 9364012.

It is an arithmetic number, because the mean of its divisors is an integer number (9364012).

Almost surely, 2^18728023 is an apocalyptic number.

18728023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18728023 is an equidigital number, since it uses as much as digits as its factorization.

18728023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18728023 is about 4327.5885895034. The cubic root of 18728023 is about 265.5608059499.

The spelling of 18728023 in words is "eighteen million, seven hundred twenty-eight thousand, twenty-three".