12643786 has 16 divisors (see below), whose sum is σ = 19531368. Its totient is φ = 6136000.

The previous prime is 12643783. The next prime is 12643793. The reversal of 12643786 is 68734621.

12643786 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 4 ways, for example, as 11799225 + 844561 = 3435^2 + 919^2 .

It is not an unprimeable number, because it can be changed into a prime (12643781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10116 + ... + 11296.

Almost surely, 2^12643786 is an apocalyptic number.

12643786 is a deficient number, since it is larger than the sum of its proper divisors (6887582).

12643786 is a wasteful number, since it uses less digits than its factorization.

12643786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337.

The product of its digits is 48384, while the sum is 37.

The square root of 12643786 is about 3555.8101749109. The cubic root of 12643786 is about 232.9659119884.

It can be divided in two parts, 1264 and 3786, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 12643786 in words is "twelve million, six hundred forty-three thousand, seven hundred eighty-six".