8421773 has 2 divisors, whose sum is σ = 8421774. Its totient is φ = 8421772.

The previous prime is 8421757. The next prime is 8421779. The reversal of 8421773 is 3771248.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8421604 + 169 = 2902^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421773 - 2⁴ = 8421757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421779) 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, 4210886 + 4210887.

It is an arithmetic number, because the mean of its divisors is an integer number (4210887).

Almost surely, 2^8421773 is an apocalyptic number.

It is an amenable number.

8421773 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421773 is an equidigital number, since it uses as much as digits as its factorization.

8421773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 32.

The square root of 8421773 is about 2902.0291177037. The cubic root of 8421773 is about 203.4547547350.

The spelling of 8421773 in words is "eight million, four hundred twenty-one thousand, seven hundred seventy-three".