12378312 has 64 divisors (see below), whose sum is σ = 36417600. Its totient is φ = 3882240.

The previous prime is 12378307. The next prime is 12378319. The reversal of 12378312 is 21387321.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12378319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1987 + ... + 5357.

It is an arithmetic number, because the mean of its divisors is an integer number (569025).

Almost surely, 2^12378312 is an apocalyptic number.

12378312 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 12378312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18208800).

12378312 is an abundant number, since it is smaller than the sum of its proper divisors (24039288).

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

12378312 is a wasteful number, since it uses less digits than its factorization.

12378312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403 (or 3393 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 12378312 is about 3518.2825355562. The cubic root of 12378312 is about 231.3238836721.

Subtracting 12378312 from its reverse (21387321), we obtain a palindrome (9009009).

The spelling of 12378312 in words is "twelve million, three hundred seventy-eight thousand, three hundred twelve".