863939 has 8 divisors (see below), whose sum is σ = 923520. Its totient is φ = 807240.

The previous prime is 863921. The next prime is 863959. The reversal of 863939 is 939368.

It is a happy number.

It is not a de Polignac number, because 863939 - 2¹⁶ = 798403 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863909) 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 in 7 ways as a sum of consecutive naturals, for example, 27854 + ... + 27884.

It is an arithmetic number, because the mean of its divisors is an integer number (115440).

2⁸⁶³⁹³⁹ is an apocalyptic number.

863939 is a deficient number, since it is larger than the sum of its proper divisors (59581).

863939 is an frugal number, since it uses more digits than its factorization.

863939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 60 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 863939 is about 929.4831897350. The cubic root of 863939 is about 95.2418215963.

The spelling of 863939 in words is "eight hundred sixty-three thousand, nine hundred thirty-nine".