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23891 = 73413
BaseRepresentation
bin101110101010011
31012202212
411311103
51231031
6302335
7126440
oct56523
935685
1023891
1116a4a
12119ab
13ab4a
1489c7
15712b
hex5d53

23891 has 4 divisors (see below), whose sum is σ = 27312. Its totient is φ = 20472.

The previous prime is 23887. The next prime is 23893. The reversal of 23891 is 19832.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23891 - 22 = 23887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (23893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1700 + ... + 1713.

It is an arithmetic number, because the mean of its divisors is an integer number (6828).

223891 is an apocalyptic number.

23891 is a deficient number, since it is larger than the sum of its proper divisors (3421).

23891 is an equidigital number, since it uses as much as digits as its factorization.

23891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420.

The product of its digits is 432, while the sum is 23.

The square root of 23891 is about 154.5671375164. The cubic root of 23891 is about 28.8012570182.

The spelling of 23891 in words is "twenty-three thousand, eight hundred ninety-one".

Divisors: 1 7 3413 23891