12640841 has 2 divisors, whose sum is σ = 12640842. Its totient is φ = 12640840.

The previous prime is 12640829. The next prime is 12640867. The reversal of 12640841 is 14804621.

It is an a-pointer prime, because the next prime (12640867) can be obtained adding 12640841 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 495616 = 3485^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640841 - 2¹⁰ = 12639817 is a prime.

It is a super-2 number, since 2×12640841² = 319581722374562, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12640841.

It is not a weakly prime, because it can be changed into another prime (12640891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320420 + 6320421.

It is an arithmetic number, because the mean of its divisors is an integer number (6320421).

Almost surely, 2^12640841 is an apocalyptic number.

It is an amenable number.

12640841 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640841 is an equidigital number, since it uses as much as digits as its factorization.

12640841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 12640841 is about 3555.3960398245. The cubic root of 12640841 is about 232.9478230529.

The spelling of 12640841 in words is "twelve million, six hundred forty thousand, eight hundred forty-one".