219823 has 2 divisors, whose sum is σ = 219824. Its totient is φ = 219822.

The previous prime is 219809. The next prime is 219829. The reversal of 219823 is 328912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 219823 - 2⁹ = 219311 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109911 + 109912.

It is an arithmetic number, because the mean of its divisors is an integer number (109912).

2²¹⁹⁸²³ is an apocalyptic number.

219823 is a deficient number, since it is larger than the sum of its proper divisors (1).

219823 is an equidigital number, since it uses as much as digits as its factorization.

219823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 219823 is about 468.8528553822. The cubic root of 219823 is about 60.3519133955.

The spelling of 219823 in words is "two hundred nineteen thousand, eight hundred twenty-three".