825439 has 2 divisors, whose sum is σ = 825440. Its totient is φ = 825438.

The previous prime is 825421. The next prime is 825443. The reversal of 825439 is 934528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825439 - 2¹⁷ = 694367 is a prime.

It is a Chen prime.

825439 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 825439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412719 + 412720.

It is an arithmetic number, because the mean of its divisors is an integer number (412720).

2⁸²⁵⁴³⁹ is an apocalyptic number.

825439 is a deficient number, since it is larger than the sum of its proper divisors (1).

825439 is an equidigital number, since it uses as much as digits as its factorization.

825439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 825439 is about 908.5367356359. The cubic root of 825439 is about 93.8055055014.

The spelling of 825439 in words is "eight hundred twenty-five thousand, four hundred thirty-nine".