12644026 has 4 divisors (see below), whose sum is σ = 18966042. Its totient is φ = 6322012.

The previous prime is 12644017. The next prime is 12644041. The reversal of 12644026 is 62044621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62044621 = 223 ⋅278227.

It can be written as a sum of positive squares in only one way, i.e., 10556001 + 2088025 = 3249^2 + 1445^2 .

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 as a sum of consecutive naturals, namely, 3161005 + ... + 3161008.

Almost surely, 2^12644026 is an apocalyptic number.

12644026 is a deficient number, since it is larger than the sum of its proper divisors (6322016).

12644026 is an equidigital number, since it uses as much as digits as its factorization.

12644026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322015.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 12644026 is about 3555.8439223340. The cubic root of 12644026 is about 232.9673860053.

Adding to 12644026 its reverse (62044621), we get a palindrome (74688647).

The spelling of 12644026 in words is "twelve million, six hundred forty-four thousand, twenty-six".