863799 has 4 divisors (see below), whose sum is σ = 1151736. Its totient is φ = 575864.

The previous prime is 863783. The next prime is 863801. The reversal of 863799 is 997368.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 863799 - 2⁴ = 863783 is a prime.

It is a super-2 number, since 2×863799² = 1492297424802, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 863799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143964 + ... + 143969.

It is an arithmetic number, because the mean of its divisors is an integer number (287934).

2⁸⁶³⁷⁹⁹ is an apocalyptic number.

863799 is a deficient number, since it is larger than the sum of its proper divisors (287937).

863799 is a wasteful number, since it uses less digits than its factorization.

863799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287936.

The product of its digits is 81648, while the sum is 42.

The square root of 863799 is about 929.4078760157. The cubic root of 863799 is about 95.2366767209.

The spelling of 863799 in words is "eight hundred sixty-three thousand, seven hundred ninety-nine".