190989 has 6 divisors (see below), whose sum is σ = 275886. Its totient is φ = 127320.

The previous prime is 190979. The next prime is 190997. The reversal of 190989 is 989091.

190989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 189225 + 1764 = 435^2 + 42^2 .

It is not a de Polignac number, because 190989 - 2¹¹ = 188941 is a prime.

190989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10602 + ... + 10619.

It is an arithmetic number, because the mean of its divisors is an integer number (45981).

2¹⁹⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

190989 is a deficient number, since it is larger than the sum of its proper divisors (84897).

190989 is a wasteful number, since it uses less digits than its factorization.

190989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21227 (or 21224 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 190989 is about 437.0228826961. The cubic root of 190989 is about 57.5885466232.

The spelling of 190989 in words is "one hundred ninety thousand, nine hundred eighty-nine".