199705 has 8 divisors (see below), whose sum is σ = 261504. Its totient is φ = 145200.

The previous prime is 199697. The next prime is 199721. The reversal of 199705 is 507991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199705 - 2³ = 199697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1761 + ... + 1870.

It is an arithmetic number, because the mean of its divisors is an integer number (32688).

2¹⁹⁹⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

199705 is a deficient number, since it is larger than the sum of its proper divisors (61799).

199705 is a wasteful number, since it uses less digits than its factorization.

199705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 199705 is about 446.8836537624. The cubic root of 199705 is about 58.4515877748.

The spelling of 199705 in words is "one hundred ninety-nine thousand, seven hundred five".