18216827 has 4 divisors (see below), whose sum is σ = 18289656. Its totient is φ = 18144000.

The previous prime is 18216823. The next prime is 18216853. The reversal of 18216827 is 72861281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18216827 - 2² = 18216823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18216823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36038 + ... + 36539.

It is an arithmetic number, because the mean of its divisors is an integer number (4572414).

Almost surely, 2^18216827 is an apocalyptic number.

18216827 is a deficient number, since it is larger than the sum of its proper divisors (72829).

18216827 is an equidigital number, since it uses as much as digits as its factorization.

18216827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72828.

The product of its digits is 10752, while the sum is 35.

The square root of 18216827 is about 4268.1175007256. The cubic root of 18216827 is about 263.1222522907.

The spelling of 18216827 in words is "eighteen million, two hundred sixteen thousand, eight hundred twenty-seven".