247823 has 4 divisors (see below), whose sum is σ = 251040. Its totient is φ = 244608.

The previous prime is 247813. The next prime is 247829. The reversal of 247823 is 328742.

247823 is nontrivially palindromic in base 12.

247823 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, and also an emirpimes, since its reverse is a distinct semiprime: 328742 = 2 ⋅164371.

It is a cyclic number.

It is not a de Polignac number, because 247823 - 2⁶ = 247759 is a prime.

It is a super-2 number, since 2×247823² = 122832478658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 247792 and 247801.

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, 1490 + ... + 1647.

It is an arithmetic number, because the mean of its divisors is an integer number (62760).

2²⁴⁷⁸²³ is an apocalyptic number.

247823 is a deficient number, since it is larger than the sum of its proper divisors (3217).

247823 is an equidigital number, since it uses as much as digits as its factorization.

247823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216.

The product of its digits is 2688, while the sum is 26.

The square root of 247823 is about 497.8182399230. The cubic root of 247823 is about 62.8126625987.

The spelling of 247823 in words is "two hundred forty-seven thousand, eight hundred twenty-three".