189806 has 4 divisors (see below), whose sum is σ = 284712. Its totient is φ = 94902.

The previous prime is 189799. The next prime is 189817. The reversal of 189806 is 608981.

189806 is nontrivially palindromic in base 4 and base 7.

189806 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608981 = 461 ⋅1321.

It is a congruent number.

It is an unprimeable number.

189806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47450 + ... + 47453.

It is an arithmetic number, because the mean of its divisors is an integer number (71178).

2¹⁸⁹⁸⁰⁶ is an apocalyptic number.

189806 is a deficient number, since it is larger than the sum of its proper divisors (94906).

189806 is an equidigital number, since it uses as much as digits as its factorization.

189806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94905.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 189806 is about 435.6673042587. The cubic root of 189806 is about 57.4693977046.

The spelling of 189806 in words is "one hundred eighty-nine thousand, eight hundred six".