8384439921 has 32 divisors (see below), whose sum is σ = 13146177408. Its totient is φ = 4686128640.

The previous prime is 8384439919. The next prime is 8384439949. The reversal of 8384439921 is 1299344838.

It is not a de Polignac number, because 8384439921 - 2¹ = 8384439919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8384439911) 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 31 ways as a sum of consecutive naturals, for example, 470445 + ... + 487941.

It is an arithmetic number, because the mean of its divisors is an integer number (410818044).

Almost surely, 2^8384439921 is an apocalyptic number.

It is an amenable number.

8384439921 is a deficient number, since it is larger than the sum of its proper divisors (4761737487).

8384439921 is a wasteful number, since it uses less digits than its factorization.

8384439921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18641.

The product of its digits is 1492992, while the sum is 51.

The square root of 8384439921 is about 91566.5873613296. The cubic root of 8384439921 is about 2031.5367625994.

The spelling of 8384439921 in words is "eight billion, three hundred eighty-four million, four hundred thirty-nine thousand, nine hundred twenty-one".