12081312 has 120 divisors (see below), whose sum is σ = 36590400. Its totient is φ = 3908736.

The previous prime is 12081299. The next prime is 12081319. The reversal of 12081312 is 21318021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12081319) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 152889 + ... + 152967.

It is an arithmetic number, because the mean of its divisors is an integer number (304920).

Almost surely, 2^12081312 is an apocalyptic number.

12081312 is a gapful number since it is divisible by the number (12) 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 12081312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18295200).

12081312 is an abundant number, since it is smaller than the sum of its proper divisors (24509088).

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

12081312 is an equidigital number, since it uses as much as digits as its factorization.

12081312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12081312 is about 3475.8181770628. The cubic root of 12081312 is about 229.4587904990.

Adding to 12081312 its reverse (21318021), we get a palindrome (33399333).

The spelling of 12081312 in words is "twelve million, eighty-one thousand, three hundred twelve".