489865 has 4 divisors (see below), whose sum is σ = 587844. Its totient is φ = 391888.

The previous prime is 489851. The next prime is 489869. The reversal of 489865 is 568984.

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 389376 + 100489 = 624^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 489865 - 2⁵ = 489833 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489869) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 48982 + ... + 48991.

It is an arithmetic number, because the mean of its divisors is an integer number (146961).

2⁴⁸⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

489865 is a deficient number, since it is larger than the sum of its proper divisors (97979).

489865 is an equidigital number, since it uses as much as digits as its factorization.

489865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97978.

The product of its digits is 69120, while the sum is 40.

The square root of 489865 is about 699.9035647859. The cubic root of 489865 is about 78.8301108011.

The spelling of 489865 in words is "four hundred eighty-nine thousand, eight hundred sixty-five".