18363645 has 16 divisors (see below), whose sum is σ = 32646720. Its totient is φ = 9793872.

The previous prime is 18363601. The next prime is 18363647. The reversal of 18363645 is 54636381.

18363645 is a `hidden beast` number, since 1 + 8 + 3 + 6 + 3 + 645 = 666.

It is not a de Polignac number, because 18363645 - 2⁹ = 18363133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363647) 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 in 15 ways as a sum of consecutive naturals, for example, 67879 + ... + 68148.

It is an arithmetic number, because the mean of its divisors is an integer number (2040420).

Almost surely, 2^18363645 is an apocalyptic number.

18363645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18363645 is a deficient number, since it is larger than the sum of its proper divisors (14283075).

18363645 is a wasteful number, since it uses less digits than its factorization.

18363645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136041 (or 136035 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 18363645 is about 4285.2823710929. The cubic root of 18363645 is about 263.8272371745.

The spelling of 18363645 in words is "eighteen million, three hundred sixty-three thousand, six hundred forty-five".