6863855 has 4 divisors (see below), whose sum is σ = 8236632. Its totient is φ = 5491080.

The previous prime is 6863849. The next prime is 6863861. The reversal of 6863855 is 5583686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5583686 = 2 ⋅2791843.

It is an interprime number because it is at equal distance from previous prime (6863849) and next prime (6863861).

It is not a de Polignac number, because 6863855 - 2¹⁰ = 6862831 is a prime.

It is a super-2 number, since 2×6863855² = 94225010922050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686381 + ... + 686390.

It is an arithmetic number, because the mean of its divisors is an integer number (2059158).

Almost surely, 2^6863855 is an apocalyptic number.

6863855 is a deficient number, since it is larger than the sum of its proper divisors (1372777).

6863855 is a wasteful number, since it uses less digits than its factorization.

6863855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372776.

The product of its digits is 172800, while the sum is 41.

The square root of 6863855 is about 2619.8959903019. The cubic root of 6863855 is about 190.0448186052.

The spelling of 6863855 in words is "six million, eight hundred sixty-three thousand, eight hundred fifty-five".