199739 has 2 divisors, whose sum is σ = 199740. Its totient is φ = 199738.

The previous prime is 199729. The next prime is 199741. The reversal of 199739 is 937991.

It is a happy number.

199739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (937991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199739 - 2⁸ = 199483 is a prime.

Together with 199741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99869 + 99870.

It is an arithmetic number, because the mean of its divisors is an integer number (99870).

2¹⁹⁹⁷³⁹ is an apocalyptic number.

199739 is a deficient number, since it is larger than the sum of its proper divisors (1).

199739 is an equidigital number, since it uses as much as digits as its factorization.

199739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309, while the sum is 38.

The square root of 199739 is about 446.9216933647. The cubic root of 199739 is about 58.4549047360.

The spelling of 199739 in words is "one hundred ninety-nine thousand, seven hundred thirty-nine".