18868868 has 6 divisors (see below), whose sum is σ = 33020526. Its totient is φ = 9434432.

The previous prime is 18868867. The next prime is 18868877. The reversal of 18868868 is 86886881.

It can be written as a sum of positive squares in only one way, i.e., 11888704 + 6980164 = 3448^2 + 2642^2 .

It is not an unprimeable number, because it can be changed into a prime (18868867) 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, 2358605 + ... + 2358612.

It is an arithmetic number, because the mean of its divisors is an integer number (5503421).

Almost surely, 2^18868868 is an apocalyptic number.

It is an amenable number.

18868868 is a deficient number, since it is larger than the sum of its proper divisors (14151658).

18868868 is a wasteful number, since it uses less digits than its factorization.

18868868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717221 (or 4717219 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 53.

The square root of 18868868 is about 4343.8310280212. The cubic root of 18868868 is about 266.2248649742.

The spelling of 18868868 in words is "eighteen million, eight hundred sixty-eight thousand, eight hundred sixty-eight".