247839 has 4 divisors (see below), whose sum is σ = 330456. Its totient is φ = 165224.

The previous prime is 247829. The next prime is 247847. The reversal of 247839 is 938742.

247839 is digitally balanced in base 7, 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 a cyclic number.

It is not a de Polignac number, because 247839 - 2⁷ = 247711 is a prime.

It is a super-2 number, since 2×247839² = 122848339842, which contains 22 as substring.

It is a D-number.

247839 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247829) 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, 41304 + ... + 41309.

It is an arithmetic number, because the mean of its divisors is an integer number (82614).

2²⁴⁷⁸³⁹ is an apocalyptic number.

247839 is a deficient number, since it is larger than the sum of its proper divisors (82617).

247839 is an equidigital number, since it uses as much as digits as its factorization.

247839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82616.

The product of its digits is 12096, while the sum is 33.

The square root of 247839 is about 497.8343097859. The cubic root of 247839 is about 62.8140143443.

The spelling of 247839 in words is "two hundred forty-seven thousand, eight hundred thirty-nine".