18868 has 12 divisors (see below), whose sum is σ = 34020. Its totient is φ = 9152.

The previous prime is 18859. The next prime is 18869. The reversal of 18868 is 86881.

It can be written as a sum of positive squares in 2 ways, for example, as 8464 + 10404 = 92^2 + 102^2 .

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168 + ... + 256.

It is an arithmetic number, because the mean of its divisors is an integer number (2835).

2¹⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

18868 is a deficient number, since it is larger than the sum of its proper divisors (15152).

18868 is a wasteful number, since it uses less digits than its factorization.

18868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 144 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The square root of 18868 is about 137.3608386695. The cubic root of 18868 is about 26.6220782646.

It can be divided in two parts, 188 and 68, that added together give a 8-th power (256 = 2⁸).

The spelling of 18868 in words is "eighteen thousand, eight hundred sixty-eight".