18718 has 12 divisors (see below), whose sum is σ = 32832. Its totient is φ = 7980.

The previous prime is 18713. The next prime is 18719. The reversal of 18718 is 81781.

It is a junction number, because it is equal to n+sod(n) for n = 18692 and 18701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713) 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 5 ways as a sum of consecutive naturals, for example, 3 + ... + 193.

It is an arithmetic number, because the mean of its divisors is an integer number (2736).

2¹⁸⁷¹⁸ is an apocalyptic number.

18718 is a deficient number, since it is larger than the sum of its proper divisors (14114).

18718 is a wasteful number, since it uses less digits than its factorization.

18718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 200 counting only the distinct ones).

The product of its digits is 448, while the sum is 25.

The square root of 18718 is about 136.8137419998. The cubic root of 18718 is about 26.5513422573.

The spelling of 18718 in words is "eighteen thousand, seven hundred eighteen".