189965 has 4 divisors (see below), whose sum is σ = 227964. Its totient is φ = 151968.

The previous prime is 189961. The next prime is 189967. The reversal of 189965 is 569981.

189965 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 27556 + 162409 = 166^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 189965 - 2² = 189961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189961) 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, 18992 + ... + 19001.

It is an arithmetic number, because the mean of its divisors is an integer number (56991).

2¹⁸⁹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

189965 is a deficient number, since it is larger than the sum of its proper divisors (37999).

189965 is an equidigital number, since it uses as much as digits as its factorization.

189965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37998.

The product of its digits is 19440, while the sum is 38.

The square root of 189965 is about 435.8497447516. The cubic root of 189965 is about 57.4854405481.

The spelling of 189965 in words is "one hundred eighty-nine thousand, nine hundred sixty-five".