199983709 has 2 divisors, whose sum is σ = 199983710. Its totient is φ = 199983708.

The previous prime is 199983703. The next prime is 199983727. The reversal of 199983709 is 907389991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196616484 + 3367225 = 14022^2 + 1835^2 .

It is a cyclic number.

It is not a de Polignac number, because 199983709 - 2³ = 199983701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199983709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199983701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99991854 + 99991855.

It is an arithmetic number, because the mean of its divisors is an integer number (99991855).

Almost surely, 2^199983709 is an apocalyptic number.

It is an amenable number.

199983709 is a deficient number, since it is larger than the sum of its proper divisors (1).

199983709 is an equidigital number, since it uses as much as digits as its factorization.

199983709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 199983709 is about 14141.5596381729. The cubic root of 199983709 is about 584.7876688204.

The spelling of 199983709 in words is "one hundred ninety-nine million, nine hundred eighty-three thousand, seven hundred nine".