23905 has 8 divisors (see below), whose sum is σ = 32832. Its totient is φ = 16368.

The previous prime is 23899. The next prime is 23909. The reversal of 23905 is 50932.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23905 - 2⁵ = 23873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307 + ... + 376.

It is an arithmetic number, because the mean of its divisors is an integer number (4104).

2²³⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

23905 is a deficient number, since it is larger than the sum of its proper divisors (8927).

23905 is an equidigital number, since it uses as much as digits as its factorization.

23905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 23905 is about 154.6124186474. The cubic root of 23905 is about 28.8068817145.

The spelling of 23905 in words is "twenty-three thousand, nine hundred five".