389865 has 32 divisors (see below), whose sum is σ = 737280. Its totient is φ = 172224.

The previous prime is 389849. The next prime is 389867. The reversal of 389865 is 568983.

It is not a de Polignac number, because 389865 - 2⁴ = 389849 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4896 + ... + 4974.

It is an arithmetic number, because the mean of its divisors is an integer number (23040).

2³⁸⁹⁸⁶⁵ is an apocalyptic number.

389865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

389865 is a deficient number, since it is larger than the sum of its proper divisors (347415).

389865 is a wasteful number, since it uses less digits than its factorization.

389865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141.

The product of its digits is 51840, while the sum is 39.

The square root of 389865 is about 624.3917039808. The cubic root of 389865 is about 73.0530046021.

The spelling of 389865 in words is "three hundred eighty-nine thousand, eight hundred sixty-five".