19708943 has 2 divisors, whose sum is σ = 19708944. Its totient is φ = 19708942.

The previous prime is 19708939. The next prime is 19708981. The reversal of 19708943 is 34980791.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (34980791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19708943 - 2² = 19708939 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19708943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19708543) 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, 9854471 + 9854472.

It is an arithmetic number, because the mean of its divisors is an integer number (9854472).

Almost surely, 2^19708943 is an apocalyptic number.

19708943 is a deficient number, since it is larger than the sum of its proper divisors (1).

19708943 is an equidigital number, since it uses as much as digits as its factorization.

19708943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 19708943 is about 4439.4755320871. The cubic root of 19708943 is about 270.1185716066.

The spelling of 19708943 in words is "nineteen million, seven hundred eight thousand, nine hundred forty-three".