18216699 has 4 divisors (see below), whose sum is σ = 24288936. Its totient is φ = 12144464.

The previous prime is 18216661. The next prime is 18216701. The reversal of 18216699 is 99661281.

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 18216699 - 2²¹ = 16119547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18216699.

It is not an unprimeable number, because it can be changed into a prime (18216599) 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, 3036114 + ... + 3036119.

It is an arithmetic number, because the mean of its divisors is an integer number (6072234).

Almost surely, 2^18216699 is an apocalyptic number.

18216699 is a deficient number, since it is larger than the sum of its proper divisors (6072237).

18216699 is an equidigital number, since it uses as much as digits as its factorization.

18216699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6072236.

The product of its digits is 46656, while the sum is 42.

The square root of 18216699 is about 4268.1025057981. The cubic root of 18216699 is about 263.1216360156.

It can be divided in two parts, 18216 and 699, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18216699 in words is "eighteen million, two hundred sixteen thousand, six hundred ninety-nine".