18363869 has 2 divisors, whose sum is σ = 18363870. Its totient is φ = 18363868.

The previous prime is 18363857. The next prime is 18363883. The reversal of 18363869 is 96836381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 403225 = 4238^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 18363869 - 2⁴ = 18363853 is a prime.

It is a super-2 number, since 2×18363869² = 674463369298322, 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 (18363889) 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, 9181934 + 9181935.

It is an arithmetic number, because the mean of its divisors is an integer number (9181935).

Almost surely, 2^18363869 is an apocalyptic number.

It is an amenable number.

18363869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18363869 is an equidigital number, since it uses as much as digits as its factorization.

18363869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 18363869 is about 4285.3085069806. The cubic root of 18363869 is about 263.8283098929.

The spelling of 18363869 in words is "eighteen million, three hundred sixty-three thousand, eight hundred sixty-nine".