19879 has 4 divisors (see below), whose sum is σ = 20176. Its totient is φ = 19584.

The previous prime is 19867. The next prime is 19889. The reversal of 19879 is 97891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97891 = 53 ⋅1847.

It is a cyclic number.

It is not a de Polignac number, because 19879 - 2⁷ = 19751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19819) 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, 7 + ... + 199.

It is an arithmetic number, because the mean of its divisors is an integer number (5044).

2¹⁹⁸⁷⁹ is an apocalyptic number.

19879 is a deficient number, since it is larger than the sum of its proper divisors (297).

19879 is a wasteful number, since it uses less digits than its factorization.

19879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296.

The product of its digits is 4536, while the sum is 34.

The square root of 19879 is about 140.9929076230. The cubic root of 19879 is about 27.0893246443.

It can be divided in two parts, 19 and 879, that added together give a palindrome (898).

The spelling of 19879 in words is "nineteen thousand, eight hundred seventy-nine".