825839 has 4 divisors (see below), whose sum is σ = 943824. Its totient is φ = 707856.

The previous prime is 825829. The next prime is 825857. The reversal of 825839 is 938528.

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-825839 is a prime.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 825799 and 825808.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 825839.

It is not an unprimeable number, because it can be changed into a prime (825829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58982 + ... + 58995.

It is an arithmetic number, because the mean of its divisors is an integer number (235956).

2⁸²⁵⁸³⁹ is an apocalyptic number.

825839 is a deficient number, since it is larger than the sum of its proper divisors (117985).

825839 is a wasteful number, since it uses less digits than its factorization.

825839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117984.

The product of its digits is 17280, while the sum is 35.

The square root of 825839 is about 908.7568431654. The cubic root of 825839 is about 93.8206554773.

The spelling of 825839 in words is "eight hundred twenty-five thousand, eight hundred thirty-nine".