839897864 has 32 divisors (see below), whose sum is σ = 1702451520. Its totient is φ = 386158656.

The previous prime is 839897857. The next prime is 839897867. The reversal of 839897864 is 468798938.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 839897797 and 839897806.

It is not an unprimeable number, because it can be changed into a prime (839897867) 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 7 ways as a sum of consecutive naturals, for example, 11999 + ... + 42705.

It is an arithmetic number, because the mean of its divisors is an integer number (53201610).

Almost surely, 2^839897864 is an apocalyptic number.

It is an amenable number.

839897864 is an abundant number, since it is smaller than the sum of its proper divisors (862553656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

839897864 is a wasteful number, since it uses less digits than its factorization.

839897864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30989 (or 30985 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 62.

The square root of 839897864 is about 28980.9914254154. The cubic root of 839897864 is about 943.5005527361.

The spelling of 839897864 in words is "eight hundred thirty-nine million, eight hundred ninety-seven thousand, eight hundred sixty-four".