12391056 has 60 divisors (see below), whose sum is σ = 35973392. Its totient is φ = 4129056.

The previous prime is 12391039. The next prime is 12391069. The reversal of 12391056 is 65019321.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2295 + ... + 5481.

Almost surely, 2^12391056 is an apocalyptic number.

12391056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12391056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17986696).

12391056 is an abundant number, since it is smaller than the sum of its proper divisors (23582336).

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

12391056 is an equidigital number, since it uses as much as digits as its factorization.

12391056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210 (or 3192 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 12391056 is about 3520.0931805849. The cubic root of 12391056 is about 231.4032423778.

The spelling of 12391056 in words is "twelve million, three hundred ninety-one thousand, fifty-six".