199389 has 4 divisors (see below), whose sum is σ = 265856. Its totient is φ = 132924.

The previous prime is 199379. The next prime is 199399. The reversal of 199389 is 983991.

199389 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (199379) and next prime (199399).

It is not a de Polignac number, because 199389 - 2⁴ = 199373 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33229 + ... + 33234.

It is an arithmetic number, because the mean of its divisors is an integer number (66464).

2¹⁹⁹³⁸⁹ is an apocalyptic number.

It is an amenable number.

199389 is a deficient number, since it is larger than the sum of its proper divisors (66467).

199389 is an equidigital number, since it uses as much as digits as its factorization.

199389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66466.

The product of its digits is 17496, while the sum is 39.

The square root of 199389 is about 446.5299542024. The cubic root of 199389 is about 58.4207415222.

The spelling of 199389 in words is "one hundred ninety-nine thousand, three hundred eighty-nine".