839965989 has 4 divisors (see below), whose sum is σ = 1119954656. Its totient is φ = 559977324.

The previous prime is 839965979. The next prime is 839965991. The reversal of 839965989 is 989569938.

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 not a de Polignac number, because 839965989 - 2²³ = 831577381 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 (839965969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139994329 + ... + 139994334.

It is an arithmetic number, because the mean of its divisors is an integer number (279988664).

Almost surely, 2^839965989 is an apocalyptic number.

It is an amenable number.

839965989 is a deficient number, since it is larger than the sum of its proper divisors (279988667).

839965989 is a wasteful number, since it uses less digits than its factorization.

839965989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279988666.

The product of its digits is 37791360, while the sum is 66.

The square root of 839965989 is about 28982.1667409461. The cubic root of 839965989 is about 943.5260614875.

The spelling of 839965989 in words is "eight hundred thirty-nine million, nine hundred sixty-five thousand, nine hundred eighty-nine".