12456 has 24 divisors (see below), whose sum is σ = 33930. Its totient is φ = 4128.
The previous prime is 12451. The next prime is 12457. The reversal of 12456 is 65421.
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 8100 + 4356 = 90^2 + 66^2 .
It is a tau number, because it is divible by the number of its divisors (24).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a plaindrome in base 10 and base 14.
It is not an unprimeable number, because it can be changed into a prime (12451) by changing a digit.
12456 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15 + ... + 158.
212456 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 12456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16965).
12456 is an abundant number, since it is smaller than the sum of its proper divisors (21474).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
12456 is a wasteful number, since it uses less digits than its factorization.
12456 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 185 (or 178 counting only the distinct ones).
The product of its digits is 240, while the sum is 18.
The square root of 12456 is about 111.6064514264. The cubic root of 12456 is about 23.1806815003.
Adding to 12456 its reverse (65421), we get a palindrome (77877).
The spelling of 12456 in words is "twelve thousand, four hundred fifty-six".
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