23681 has 8 divisors (see below), whose sum is σ = 28800. Its totient is φ = 19008.
The previous prime is 23677. The next prime is 23687. The reversal of 23681 is 18632.
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 23681 - 22 = 23677 is a prime.
It is a super-2 number, since 2×236812 = 1121579522, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 23681.
It is not an unprimeable number, because it can be changed into a prime (23687) 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, 20 + ... + 218.
It is an arithmetic number, because the mean of its divisors is an integer number (3600).
223681 is an apocalyptic number.
It is an amenable number.
23681 is a deficient number, since it is larger than the sum of its proper divisors (5119).
23681 is a wasteful number, since it uses less digits than its factorization.
23681 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 223.
The product of its digits is 288, while the sum is 20.
The square root of 23681 is about 153.8863216793. The cubic root of 23681 is about 28.7166216286.
The spelling of 23681 in words is "twenty-three thousand, six hundred eighty-one".
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