12643828 has 6 divisors (see below), whose sum is σ = 22126706. Its totient is φ = 6321912.

The previous prime is 12643823. The next prime is 12643837. The reversal of 12643828 is 82834621.

It can be written as a sum of positive squares in only one way, i.e., 8225424 + 4418404 = 2868^2 + 2102^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12643793 and 12643802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1580475 + ... + 1580482.

Almost surely, 2^12643828 is an apocalyptic number.

It is an amenable number.

12643828 is a deficient number, since it is larger than the sum of its proper divisors (9482878).

12643828 is a wasteful number, since it uses less digits than its factorization.

12643828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160961 (or 3160959 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 12643828 is about 3555.8160807331. The cubic root of 12643828 is about 232.9661699427.

The spelling of 12643828 in words is "twelve million, six hundred forty-three thousand, eight hundred twenty-eight".