389665 has 4 divisors (see below), whose sum is σ = 467604. Its totient is φ = 311728.

The previous prime is 389663. The next prime is 389687. The reversal of 389665 is 566983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566983 = 79 ⋅7177.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 239121 = 388^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 389665 - 2¹ = 389663 is a prime.

It is a Duffinian number.

389665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (389663) 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, 38962 + ... + 38971.

It is an arithmetic number, because the mean of its divisors is an integer number (116901).

2³⁸⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

389665 is a deficient number, since it is larger than the sum of its proper divisors (77939).

389665 is an equidigital number, since it uses as much as digits as its factorization.

389665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77938.

The product of its digits is 38880, while the sum is 37.

The square root of 389665 is about 624.2315275601. The cubic root of 389665 is about 73.0405104481.

The spelling of 389665 in words is "three hundred eighty-nine thousand, six hundred sixty-five".