863539 has 2 divisors, whose sum is σ = 863540. Its totient is φ = 863538.

The previous prime is 863537. The next prime is 863561. The reversal of 863539 is 935368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 863539 - 2¹ = 863537 is a prime.

Together with 863537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (863537) 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, 431769 + 431770.

It is an arithmetic number, because the mean of its divisors is an integer number (431770).

2⁸⁶³⁵³⁹ is an apocalyptic number.

863539 is a deficient number, since it is larger than the sum of its proper divisors (1).

863539 is an equidigital number, since it uses as much as digits as its factorization.

863539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 863539 is about 929.2679914858. The cubic root of 863539 is about 95.2271204774.

The spelling of 863539 in words is "eight hundred sixty-three thousand, five hundred thirty-nine".