18105823 has 2 divisors, whose sum is σ = 18105824. Its totient is φ = 18105822.

The previous prime is 18105817. The next prime is 18105827. The reversal of 18105823 is 32850181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18105823 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18105791 and 18105800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18105827) 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, 9052911 + 9052912.

It is an arithmetic number, because the mean of its divisors is an integer number (9052912).

Almost surely, 2^18105823 is an apocalyptic number.

18105823 is a deficient number, since it is larger than the sum of its proper divisors (1).

18105823 is an equidigital number, since it uses as much as digits as its factorization.

18105823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18105823 is about 4255.0937709996. The cubic root of 18105823 is about 262.5867190431.

The spelling of 18105823 in words is "eighteen million, one hundred five thousand, eight hundred twenty-three".