12420056 has 32 divisors (see below), whose sum is σ = 25650000. Its totient is φ = 5591040.

The previous prime is 12420043. The next prime is 12420059. The reversal of 12420056 is 65002421.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9320 + ... + 10568.

Almost surely, 2^12420056 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 12420056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12825000).

12420056 is an abundant number, since it is smaller than the sum of its proper divisors (13229944).

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

12420056 is a wasteful number, since it uses less digits than its factorization.

12420056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12420056 is about 3524.2099823932. The cubic root of 12420056 is about 231.5836269389.

Adding to 12420056 its reverse (65002421), we get a palindrome (77422477).

The spelling of 12420056 in words is "twelve million, four hundred twenty thousand, fifty-six".