863959 has 2 divisors, whose sum is σ = 863960. Its totient is φ = 863958.

The previous prime is 863921. The next prime is 863983. The reversal of 863959 is 959368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863959 - 2¹⁵ = 831191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863909) 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 as a sum of consecutive naturals, namely, 431979 + 431980.

It is an arithmetic number, because the mean of its divisors is an integer number (431980).

2⁸⁶³⁹⁵⁹ is an apocalyptic number.

863959 is a deficient number, since it is larger than the sum of its proper divisors (1).

863959 is an equidigital number, since it uses as much as digits as its factorization.

863959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 863959 is about 929.4939483396. The cubic root of 863959 is about 95.2425565331.

The spelling of 863959 in words is "eight hundred sixty-three thousand, nine hundred fifty-nine".