12918943 has 2 divisors, whose sum is σ = 12918944. Its totient is φ = 12918942.

The previous prime is 12918931. The next prime is 12918979. The reversal of 12918943 is 34981921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12918943 - 2⁵ = 12918911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12918923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459471 + 6459472.

It is an arithmetic number, because the mean of its divisors is an integer number (6459472).

Almost surely, 2^12918943 is an apocalyptic number.

12918943 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918943 is an equidigital number, since it uses as much as digits as its factorization.

12918943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 12918943 is about 3594.2931154818. The cubic root of 12918943 is about 234.6437517530.

It can be divided in two parts, 12918 and 943, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 12918943 in words is "twelve million, nine hundred eighteen thousand, nine hundred forty-three".