839947 has 4 divisors (see below), whose sum is σ = 846216. Its totient is φ = 833680.

The previous prime is 839921. The next prime is 839957. The reversal of 839947 is 749938.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-839947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2929 + ... + 3202.

It is an arithmetic number, because the mean of its divisors is an integer number (211554).

2⁸³⁹⁹⁴⁷ is an apocalyptic number.

839947 is a deficient number, since it is larger than the sum of its proper divisors (6269).

839947 is a wasteful number, since it uses less digits than its factorization.

839947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6268.

The product of its digits is 54432, while the sum is 40.

The square root of 839947 is about 916.4862246646. The cubic root of 839947 is about 94.3518951378.

Subtracting from 839947 its reverse (749938), we obtain a palindrome (90009).

The spelling of 839947 in words is "eight hundred thirty-nine thousand, nine hundred forty-seven".