18027869 has 2 divisors, whose sum is σ = 18027870. Its totient is φ = 18027868.

The previous prime is 18027859. The next prime is 18027881. The reversal of 18027869 is 96872081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 2067844 = 3995^2 + 1438^2 .

It is an emirp because it is prime and its reverse (96872081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18027869 - 2⁴ = 18027853 is a prime.

It is a super-2 number, since 2×18027869² = 650008121362322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18027829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9013934 + 9013935.

It is an arithmetic number, because the mean of its divisors is an integer number (9013935).

Almost surely, 2^18027869 is an apocalyptic number.

It is an amenable number.

18027869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18027869 is an equidigital number, since it uses as much as digits as its factorization.

18027869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 18027869 is about 4245.9238099617. The cubic root of 18027869 is about 262.2093241991.

The spelling of 18027869 in words is "eighteen million, twenty-seven thousand, eight hundred sixty-nine".