18028939 has 2 divisors, whose sum is σ = 18028940. Its totient is φ = 18028938.

The previous prime is 18028931. The next prime is 18028951. The reversal of 18028939 is 93982081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18028939 - 2³ = 18028931 is a prime.

It is not a weakly prime, because it can be changed into another prime (18028931) 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, 9014469 + 9014470.

It is an arithmetic number, because the mean of its divisors is an integer number (9014470).

Almost surely, 2^18028939 is an apocalyptic number.

18028939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18028939 is an equidigital number, since it uses as much as digits as its factorization.

18028939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 18028939 is about 4246.0498112952. The cubic root of 18028939 is about 262.2145116938.

The spelling of 18028939 in words is "eighteen million, twenty-eight thousand, nine hundred thirty-nine".