18648866 has 4 divisors (see below), whose sum is σ = 27973302. Its totient is φ = 9324432.

The previous prime is 18648863. The next prime is 18648869. The reversal of 18648866 is 66884681.

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

It is an interprime number because it is at equal distance from previous prime (18648863) and next prime (18648869).

It can be written as a sum of positive squares in only one way, i.e., 17048641 + 1600225 = 4129^2 + 1265^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18648866.

It is not an unprimeable number, because it can be changed into a prime (18648863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4662215 + ... + 4662218.

Almost surely, 2^18648866 is an apocalyptic number.

18648866 is a deficient number, since it is larger than the sum of its proper divisors (9324436).

18648866 is an equidigital number, since it uses as much as digits as its factorization.

18648866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324435.

The product of its digits is 442368, while the sum is 47.

The square root of 18648866 is about 4318.4332807165. The cubic root of 18648866 is about 265.1861324341.

The spelling of 18648866 in words is "eighteen million, six hundred forty-eight thousand, eight hundred sixty-six".