18916 has 6 divisors (see below), whose sum is σ = 33110. Its totient is φ = 9456.

The previous prime is 18913. The next prime is 18917. The reversal of 18916 is 61981.

18916 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 10816 + 8100 = 104^2 + 90^2 .

It is a pancake number, because a pancake can be divided into 18916 parts by 194 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (18911) 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 as a sum of consecutive naturals, namely, 2361 + ... + 2368.

2¹⁸⁹¹⁶ is an apocalyptic number.

It is an amenable number.

18916 is a deficient number, since it is larger than the sum of its proper divisors (14194).

18916 is a wasteful number, since it uses less digits than its factorization.

18916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733 (or 4731 counting only the distinct ones).

The product of its digits is 432, while the sum is 25.

The square root of 18916 is about 137.5354499756. The cubic root of 18916 is about 26.6446345798.

The spelling of 18916 in words is "eighteen thousand, nine hundred sixteen".