12643812 has 18 divisors (see below), whose sum is σ = 31960838. Its totient is φ = 4214592.

The previous prime is 12643811. The next prime is 12643823. The reversal of 12643812 is 21834621.

12643812 is a `hidden beast` number, since 1 + 2 + 643 + 8 + 12 = 666.

12643812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12574116 + 69696 = 3546^2 + 264^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (12643811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 175573 + ... + 175644.

Almost surely, 2^12643812 is an apocalyptic number.

12643812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12643812 is an abundant number, since it is smaller than the sum of its proper divisors (19317026).

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

12643812 is a wasteful number, since it uses less digits than its factorization.

12643812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351227 (or 351222 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 12643812 is about 3555.8138308972. The cubic root of 12643812 is about 232.9660716744.

The spelling of 12643812 in words is "twelve million, six hundred forty-three thousand, eight hundred twelve".