12940643 has 2 divisors, whose sum is σ = 12940644. Its totient is φ = 12940642.

The previous prime is 12940619. The next prime is 12940649. The reversal of 12940643 is 34604921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12940643 - 2⁶ = 12940579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12940649) 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 as a sum of consecutive naturals, namely, 6470321 + 6470322.

It is an arithmetic number, because the mean of its divisors is an integer number (6470322).

Almost surely, 2^12940643 is an apocalyptic number.

12940643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12940643 is an equidigital number, since it uses as much as digits as its factorization.

12940643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 12940643 is about 3597.3105231548. The cubic root of 12940643 is about 234.7750556113.

The spelling of 12940643 in words is "twelve million, nine hundred forty thousand, six hundred forty-three".