18782 has 4 divisors (see below), whose sum is σ = 28176. Its totient is φ = 9390.

The previous prime is 18773. The next prime is 18787. The reversal of 18782 is 28781.

18782 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28781 = 17 ⋅1693.

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18782.

It is not an unprimeable number, because it can be changed into a prime (18787) by changing a digit.

18782 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4694 + ... + 4697.

It is an arithmetic number, because the mean of its divisors is an integer number (7044).

2¹⁸⁷⁸² is an apocalyptic number.

18782 is a deficient number, since it is larger than the sum of its proper divisors (9394).

18782 is an equidigital number, since it uses as much as digits as its factorization.

18782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9393.

The product of its digits is 896, while the sum is 26.

The square root of 18782 is about 137.0474370428. The cubic root of 18782 is about 26.5815690062.

Subtracting 18782 from its reverse (28781), we obtain a palindrome (9999).

The spelling of 18782 in words is "eighteen thousand, seven hundred eighty-two".