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23909 is a prime number
BaseRepresentation
bin101110101100101
31012210112
411311211
51231114
6302405
7126464
oct56545
935715
1023909
1116a66
1211a05
13ab62
1489db
15713e
hex5d65

23909 has 2 divisors, whose sum is σ = 23910. Its totient is φ = 23908.

The previous prime is 23899. The next prime is 23911. The reversal of 23909 is 90932.

23909 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14884 + 9025 = 122^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 23909 - 24 = 23893 is a prime.

It is a Sophie Germain prime.

Together with 23911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11954 + 11955.

It is an arithmetic number, because the mean of its divisors is an integer number (11955).

223909 is an apocalyptic number.

It is an amenable number.

23909 is a deficient number, since it is larger than the sum of its proper divisors (1).

23909 is an equidigital number, since it uses as much as digits as its factorization.

23909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 23909 is about 154.6253536778. The cubic root of 23909 is about 28.8084883673.

Adding to 23909 its sum of digits (23), we get a palindrome (23932).

The spelling of 23909 in words is "twenty-three thousand, nine hundred nine".