19423 has 2 divisors, whose sum is σ = 19424. Its totient is φ = 19422.

The previous prime is 19421. The next prime is 19427. The reversal of 19423 is 32491.

It is a weak prime.

It is an emirp because it is prime and its reverse (32491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19423 - 2¹ = 19421 is a prime.

Together with 19421, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 19423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9711 + 9712.

It is an arithmetic number, because the mean of its divisors is an integer number (9712).

2¹⁹⁴²³ is an apocalyptic number.

19423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19423 is an equidigital number, since it uses as much as digits as its factorization.

19423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 19.

The square root of 19423 is about 139.3664235029. The cubic root of 19423 is about 26.8805883457.

The spelling of 19423 in words is "nineteen thousand, four hundred twenty-three".