12643784 has 32 divisors (see below), whose sum is σ = 25920000. Its totient is φ = 5756160.

The previous prime is 12643783. The next prime is 12643793. The reversal of 12643784 is 48734621.

It is not an unprimeable number, because it can be changed into a prime (12643781) 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 7 ways as a sum of consecutive naturals, for example, 2717 + ... + 5715.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^12643784 is an apocalyptic number.

It is an amenable number.

12643784 is an abundant number, since it is smaller than the sum of its proper divisors (13276216).

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

12643784 is a wasteful number, since it uses less digits than its factorization.

12643784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053 (or 3049 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 12643784 is about 3555.8098936810. The cubic root of 12643784 is about 232.9658997048.

The spelling of 12643784 in words is "twelve million, six hundred forty-three thousand, seven hundred eighty-four".