847991243 has 4 divisors (see below), whose sum is σ = 925081368. Its totient is φ = 770901120.

The previous prime is 847991239. The next prime is 847991257. The reversal of 847991243 is 342199748.

847991243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 847991243 - 2² = 847991239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (847991203) 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, 38545046 + ... + 38545067.

It is an arithmetic number, because the mean of its divisors is an integer number (231270342).

Almost surely, 2^847991243 is an apocalyptic number.

847991243 is a deficient number, since it is larger than the sum of its proper divisors (77090125).

847991243 is a wasteful number, since it uses less digits than its factorization.

847991243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77090124.

The product of its digits is 435456, while the sum is 47.

The square root of 847991243 is about 29120.2891984266. The cubic root of 847991243 is about 946.5214400781.

The spelling of 847991243 in words is "eight hundred forty-seven million, nine hundred ninety-one thousand, two hundred forty-three".