11997943 has 2 divisors, whose sum is σ = 11997944. Its totient is φ = 11997942.

The previous prime is 11997929. The next prime is 11997959. The reversal of 11997943 is 34979911.

It is a happy number.

11997943 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11997943 - 2¹⁷ = 11866871 is a prime.

It is equal to p₇₈₇₉₄₈ and since 11997943 and 787948 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11997943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11997913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5998971 + 5998972.

It is an arithmetic number, because the mean of its divisors is an integer number (5998972).

Almost surely, 2^11997943 is an apocalyptic number.

11997943 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997943 is an equidigital number, since it uses as much as digits as its factorization.

11997943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 11997943 is about 3463.8047000372. The cubic root of 11997943 is about 228.9297662231.

The spelling of 11997943 in words is "eleven million, nine hundred ninety-seven thousand, nine hundred forty-three".