23819 has 2 divisors, whose sum is σ = 23820.
Its totient is φ = 23818.
The previous prime is 23813. The next prime is 23827. The reversal of 23819 is 91832.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 23819 - 28 = 23563 is a prime.
It is a super-2 number, since 2×238192 = 1134689522, which contains 22 as substring.
It is a Sophie Germain prime.
It is a junction number, because it is equal to n+sod(n) for n = 23794 and 23803.
It is not a weakly prime, because it can be changed into another prime (23813) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11909 + 11910.
It is an arithmetic number, because the mean of its divisors is an integer number (11910).
223819 is an apocalyptic number.
23819 is a deficient number, since it is larger than the sum of its proper divisors (1).
23819 is an equidigital number, since it uses as much as digits as its factorization.
23819 is an evil number, because the sum of its binary digits is even.
The product of its digits is 432, while the sum is 23.
The square root of 23819 is about 154.3340532741.
The cubic root of 23819 is about 28.7722952452.
The spelling of 23819 in words is "twenty-three thousand, eight hundred nineteen".