18779 has 4 divisors (see below), whose sum is σ = 19080. Its totient is φ = 18480.

The previous prime is 18773. The next prime is 18787. The reversal of 18779 is 97781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97781 = 277 ⋅353.

It is a cyclic number.

It is not a de Polignac number, because 18779 - 2⁸ = 18523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17 + ... + 194.

It is an arithmetic number, because the mean of its divisors is an integer number (4770).

2¹⁸⁷⁷⁹ is an apocalyptic number.

18779 is a deficient number, since it is larger than the sum of its proper divisors (301).

18779 is an equidigital number, since it uses as much as digits as its factorization.

18779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its digits is 3528, while the sum is 32.

The square root of 18779 is about 137.0364914904. The cubic root of 18779 is about 26.5801536626.

Subtracting from 18779 its product of digits (3528), we obtain a palindrome (15251).

It can be divided in two parts, 18 and 779, that added together give a palindrome (797).

The spelling of 18779 in words is "eighteen thousand, seven hundred seventy-nine".