23919 has 16 divisors (see below), whose sum is σ = 39168. Its totient is φ = 12672.

The previous prime is 23917. The next prime is 23929. The reversal of 23919 is 91932.

It is a happy number.

It is not a de Polignac number, because 23919 - 2¹ = 23917 is a prime.

It is a super-2 number, since 2×23919² = 1144237122, which contains 22 as substring.

23919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23911) 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 in 15 ways as a sum of consecutive naturals, for example, 324 + ... + 390.

It is an arithmetic number, because the mean of its divisors is an integer number (2448).

2²³⁹¹⁹ is an apocalyptic number.

23919 is a deficient number, since it is larger than the sum of its proper divisors (15249).

23919 is a wasteful number, since it uses less digits than its factorization.

23919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94.

The product of its digits is 486, while the sum is 24.

The square root of 23919 is about 154.6576865209. The cubic root of 23919 is about 28.8125042153.

Multiplying 23919 by its sum of digits (24), we get a triangular number (574056 = T₁₀₇₁).

The spelling of 23919 in words is "twenty-three thousand, nine hundred nineteen".