489985 has 12 divisors (see below), whose sum is σ = 613332. Its totient is φ = 375648.

The previous prime is 489977. The next prime is 489989. The reversal of 489985 is 589984.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 223729 = 516^2 + 473^2 .

It is not a de Polignac number, because 489985 - 2³ = 489977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

Its product of digits (103680) is a multiple of the sum of its prime factors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9219 + ... + 9271.

It is an arithmetic number, because the mean of its divisors is an integer number (51111).

2⁴⁸⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

489985 is a deficient number, since it is larger than the sum of its proper divisors (123347).

489985 is an equidigital number, since it uses as much as digits as its factorization.

489985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 101 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 489985 is about 699.9892856323. The cubic root of 489985 is about 78.8365471601.

Subtracting 489985 from its reverse (589984), we obtain a palindrome (99999).

The spelling of 489985 in words is "four hundred eighty-nine thousand, nine hundred eighty-five".