822989 has 2 divisors, whose sum is σ = 822990. Its totient is φ = 822988.

The previous prime is 822973. The next prime is 823001. The reversal of 822989 is 989228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 100489 = 850^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 822989 - 2⁴ = 822973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822949) 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 as a sum of consecutive naturals, namely, 411494 + 411495.

It is an arithmetic number, because the mean of its divisors is an integer number (411495).

2⁸²²⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

822989 is a deficient number, since it is larger than the sum of its proper divisors (1).

822989 is an equidigital number, since it uses as much as digits as its factorization.

822989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 822989 is about 907.1874117292. The cubic root of 822989 is about 93.7126049377.

The spelling of 822989 in words is "eight hundred twenty-two thousand, nine hundred eighty-nine".