12643826 has 32 divisors (see below), whose sum is σ = 21697200. Its totient is φ = 5483520.

The previous prime is 12643823. The next prime is 12643837. The reversal of 12643826 is 62834621.

It can be written as a sum of positive squares in 8 ways, for example, as 3613801 + 9030025 = 1901^2 + 3005^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12643792 and 12643801.

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 in 15 ways as a sum of consecutive naturals, for example, 30710 + ... + 31118.

Almost surely, 2^12643826 is an apocalyptic number.

12643826 is a deficient number, since it is larger than the sum of its proper divisors (9053374).

12643826 is a wasteful number, since it uses less digits than its factorization.

12643826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494.

The product of its digits is 13824, while the sum is 32.

The square root of 12643826 is about 3555.8157995037. The cubic root of 12643826 is about 232.9661576591.

The spelling of 12643826 in words is "twelve million, six hundred forty-three thousand, eight hundred twenty-six".