6863999 has 4 divisors (see below), whose sum is σ = 6872040. Its totient is φ = 6855960.

The previous prime is 6863993. The next prime is 6864019. The reversal of 6863999 is 9993686.

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 6863999 - 2²⁰ = 5815423 is a prime.

It is a super-2 number, since 2×6863999² = 94228964544002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6863993) 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, 2564 + ... + 4505.

It is an arithmetic number, because the mean of its divisors is an integer number (1718010).

Almost surely, 2^6863999 is an apocalyptic number.

6863999 is a deficient number, since it is larger than the sum of its proper divisors (8041).

6863999 is an equidigital number, since it uses as much as digits as its factorization.

6863999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040.

The product of its digits is 629856, while the sum is 50.

The square root of 6863999 is about 2619.9234721648. The cubic root of 6863999 is about 190.0461476088.

The spelling of 6863999 in words is "six million, eight hundred sixty-three thousand, nine hundred ninety-nine".