18719 has 2 divisors, whose sum is σ = 18720. Its totient is φ = 18718.

The previous prime is 18713. The next prime is 18731. The reversal of 18719 is 91781.

It is a weak prime.

It is an emirp because it is prime and its reverse (91781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18719 is a prime.

It is a super-2 number, since 2×18719² = 700801922, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 6.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9359 + 9360.

It is an arithmetic number, because the mean of its divisors is an integer number (9360).

2¹⁸⁷¹⁹ is an apocalyptic number.

18719 is a deficient number, since it is larger than the sum of its proper divisors (1).

18719 is an equidigital number, since it uses as much as digits as its factorization.

18719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 26.

The square root of 18719 is about 136.8173965547. The cubic root of 18719 is about 26.5518150797.

It can be divided in two parts, 187 and 19, that multiplied together give a palindrome (3553).

The spelling of 18719 in words is "eighteen thousand, seven hundred nineteen".