847939 has 4 divisors (see below), whose sum is σ = 852400. Its totient is φ = 843480.

The previous prime is 847937. The next prime is 847949. The reversal of 847939 is 939748.

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

It is a cyclic number.

It is not a de Polignac number, because 847939 - 2¹ = 847937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (847933) 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, 1932 + ... + 2329.

It is an arithmetic number, because the mean of its divisors is an integer number (213100).

2⁸⁴⁷⁹³⁹ is an apocalyptic number.

847939 is a deficient number, since it is larger than the sum of its proper divisors (4461).

847939 is a wasteful number, since it uses less digits than its factorization.

847939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460.

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

The square root of 847939 is about 920.8360331785. The cubic root of 847939 is about 94.6502001931.

Subtracting 847939 from its reverse (939748), we obtain a square (91809 = 303²).

The spelling of 847939 in words is "eight hundred forty-seven thousand, nine hundred thirty-nine".