12844640 has 24 divisors (see below), whose sum is σ = 30345840. Its totient is φ = 5137792.

The previous prime is 12844631. The next prime is 12844679. The reversal of 12844640 is 4644821.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 39980 + ... + 40299.

It is an arithmetic number, because the mean of its divisors is an integer number (1264410).

Almost surely, 2^12844640 is an apocalyptic number.

12844640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12844640 is an abundant number, since it is smaller than the sum of its proper divisors (17501200).

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

12844640 is an equidigital number, since it uses as much as digits as its factorization.

12844640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80294 (or 80286 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 12844640 is about 3583.9419638158. The cubic root of 12844640 is about 234.1930371949.

The spelling of 12844640 in words is "twelve million, eight hundred forty-four thousand, six hundred forty".