199740943 has 2 divisors, whose sum is σ = 199740944. Its totient is φ = 199740942.

The previous prime is 199740917. The next prime is 199740979. The reversal of 199740943 is 349047991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199740943 - 2²¹ = 197643791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199740893 and 199740902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199770943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99870471 + 99870472.

It is an arithmetic number, because the mean of its divisors is an integer number (99870472).

Almost surely, 2^199740943 is an apocalyptic number.

199740943 is a deficient number, since it is larger than the sum of its proper divisors (1).

199740943 is an equidigital number, since it uses as much as digits as its factorization.

199740943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 199740943 is about 14132.9736078435. The cubic root of 199740943 is about 584.5509427917.

The spelling of 199740943 in words is "one hundred ninety-nine million, seven hundred forty thousand, nine hundred forty-three".