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23156 = 227827

23156 has 12 divisors (see below), whose sum is σ = 46368. Its totient is φ = 9912.

The previous prime is 23143. The next prime is 23159. The reversal of 23156 is 65132.

23156 is an admirable number.

It is a plaindrome in base 9.

It is a nialpdrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 23156.

It is not an unprimeable number, because it can be changed into a prime (23159) by changing a digit.

23156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386 + ... + 441.

It is an arithmetic number, because the mean of its divisors is an integer number (3864).

223156 is an apocalyptic number.

It is an amenable number.

23156 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23184).

23156 is a wasteful number, since it uses less digits than its factorization.

23156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 836 counting only the distinct ones).

The product of its digits is 180, while the sum is 17.

The square root of 23156 is about 152.1709564930. The cubic root of 23156 is about 28.5028211017.

Adding to 23156 its reverse (65132), we get a palindrome (88288).

The spelling of 23156 in words is "twenty-three thousand, one hundred fifty-six".

Divisors: 1 2 4 7 14 28 827 1654 3308 5789 11578 23156