820489 has 2 divisors, whose sum is σ = 820490. Its totient is φ = 820488.

The previous prime is 820481. The next prime is 820537. The reversal of 820489 is 984028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501264 + 319225 = 708^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 820489 - 2³ = 820481 is a prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 820489.

It is not a weakly prime, because it can be changed into another prime (820481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410244 + 410245.

It is an arithmetic number, because the mean of its divisors is an integer number (410245).

2⁸²⁰⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

820489 is a deficient number, since it is larger than the sum of its proper divisors (1).

820489 is an equidigital number, since it uses as much as digits as its factorization.

820489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 820489 is about 905.8084786532. The cubic root of 820489 is about 93.6176181923.

The spelling of 820489 in words is "eight hundred twenty thousand, four hundred eighty-nine".