489689 has 2 divisors, whose sum is σ = 489690. Its totient is φ = 489688.

The previous prime is 489679. The next prime is 489691. The reversal of 489689 is 986984.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 80089 = 640^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 489689 - 2⁴ = 489673 is a prime.

It is a Sophie Germain prime.

Together with 489691, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (489659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244844 + 244845.

It is an arithmetic number, because the mean of its divisors is an integer number (244845).

2⁴⁸⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

489689 is a deficient number, since it is larger than the sum of its proper divisors (1).

489689 is an equidigital number, since it uses as much as digits as its factorization.

489689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 44.

The square root of 489689 is about 699.7778218835. Note that the first 3 decimals coincide. The cubic root of 489689 is about 78.8206689063.

The spelling of 489689 in words is "four hundred eighty-nine thousand, six hundred eighty-nine".