990589 has 2 divisors, whose sum is σ = 990590. Its totient is φ = 990588.

The previous prime is 990559. The next prime is 990593. The reversal of 990589 is 985099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574564 + 416025 = 758^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 990589 - 2¹¹ = 988541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495294 + 495295.

It is an arithmetic number, because the mean of its divisors is an integer number (495295).

2⁹⁹⁰⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

990589 is a deficient number, since it is larger than the sum of its proper divisors (1).

990589 is an equidigital number, since it uses as much as digits as its factorization.

990589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 990589 is about 995.2833767325. The cubic root of 990589 is about 99.6853107455.

The spelling of 990589 in words is "nine hundred ninety thousand, five hundred eighty-nine".