199806 has 8 divisors (see below), whose sum is σ = 399624. Its totient is φ = 66600.

The previous prime is 199799. The next prime is 199807. The reversal of 199806 is 608991.

It is a happy number.

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

199806 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 199806.

It is not an unprimeable number, because it can be changed into a prime (199807) by changing a digit.

199806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16645 + ... + 16656.

It is an arithmetic number, because the mean of its divisors is an integer number (49953).

2¹⁹⁹⁸⁰⁶ is an apocalyptic number.

199806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199806 is a wasteful number, since it uses less digits than its factorization.

199806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33306.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 199806 is about 446.9966442827. The cubic root of 199806 is about 58.4614399991.

The spelling of 199806 in words is "one hundred ninety-nine thousand, eight hundred six".