8420985873 has 6 divisors (see below), whose sum is σ = 12163646274. Its totient is φ = 5613990576.

The previous prime is 8420985871. The next prime is 8420985913. The reversal of 8420985873 is 3785890248.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4490072064 + 3930913809 = 67008^2 + 62697^2 .

It is not a de Polignac number, because 8420985873 - 2¹ = 8420985871 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8420985871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 467832540 + ... + 467832557.

It is an arithmetic number, because the mean of its divisors is an integer number (2027274379).

Almost surely, 2^8420985873 is an apocalyptic number.

It is an amenable number.

8420985873 is a deficient number, since it is larger than the sum of its proper divisors (3742660401).

8420985873 is a wasteful number, since it uses less digits than its factorization.

8420985873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935665103 (or 935665100 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The square root of 8420985873 is about 91765.9298051297. The cubic root of 8420985873 is about 2034.4841601743.

The spelling of 8420985873 in words is "eight billion, four hundred twenty million, nine hundred eighty-five thousand, eight hundred seventy-three".