8383940821 has 4 divisors (see below), whose sum is σ = 8414878144. Its totient is φ = 8353003500.

The previous prime is 8383940777. The next prime is 8383940827. The reversal of 8383940821 is 1280493838.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8383940821 - 2⁷ = 8383940693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8383940827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15468255 + ... + 15468796.

It is an arithmetic number, because the mean of its divisors is an integer number (2103719536).

Almost surely, 2^8383940821 is an apocalyptic number.

It is an amenable number.

8383940821 is a deficient number, since it is larger than the sum of its proper divisors (30937323).

8383940821 is a wasteful number, since it uses less digits than its factorization.

8383940821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30937322.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 8383940821 is about 91563.8619816792. The cubic root of 8383940821 is about 2031.4964514147.

The spelling of 8383940821 in words is "eight billion, three hundred eighty-three million, nine hundred forty thousand, eight hundred twenty-one".