18706 has 8 divisors (see below), whose sum is σ = 28800. Its totient is φ = 9108.

The previous prime is 18701. The next prime is 18713. The reversal of 18706 is 60781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 6.

It is a nialpdrome in base 8.

It is a zygodrome in base 3 and base 8.

It is not an unprimeable number, because it can be changed into a prime (18701) by changing a digit.

18706 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6 + ... + 193.

It is an arithmetic number, because the mean of its divisors is an integer number (3600).

2¹⁸⁷⁰⁶ is an apocalyptic number.

18706 is the 87-th centered pentagonal number.

18706 is a deficient number, since it is larger than the sum of its proper divisors (10094).

18706 is a wasteful number, since it uses less digits than its factorization.

18706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 18706 is about 136.7698797250. The cubic root of 18706 is about 26.5456670744.

The spelling of 18706 in words is "eighteen thousand, seven hundred six".