8420385992 has 12 divisors (see below), whose sum is σ = 15788710395. Its totient is φ = 4210063224.

The previous prime is 8420385989. The next prime is 8420386061. The reversal of 8420385992 is 2995830248.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 4210192996 + 4210192996 = 64886^2 + 64886^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=64886.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8420385992.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 243323 + ... + 275765.

Almost surely, 2^8420385992 is an apocalyptic number.

It is an amenable number.

8420385992 is a deficient number, since it is larger than the sum of its proper divisors (7368324403).

8420385992 is an frugal number, since it uses more digits than its factorization.

8420385992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64892 (or 32445 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 8420385992 is about 91762.6612081406. The cubic root of 8420385992 is about 2034.4358492286.

Multiplying 8420385992 by its sum of digits (50), we get a square (421019299600 = 648860²).

The spelling of 8420385992 in words is "eight billion, four hundred twenty million, three hundred eighty-five thousand, nine hundred ninety-two".