12643312 has 20 divisors (see below), whose sum is σ = 26723736. Its totient is φ = 5746880.

The previous prime is 12643283. The next prime is 12643313. The reversal of 12643312 is 21334621.

12643312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35743 + ... + 36094.

Almost surely, 2^12643312 is an apocalyptic number.

It is an amenable number.

12643312 is an abundant number, since it is smaller than the sum of its proper divisors (14080424).

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

12643312 is a wasteful number, since it uses less digits than its factorization.

12643312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71856 (or 71850 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 12643312 is about 3555.7435228093. The cubic root of 12643312 is about 232.9630007501.

Adding to 12643312 its reverse (21334621), we get a palindrome (33977933).

The spelling of 12643312 in words is "twelve million, six hundred forty-three thousand, three hundred twelve".