6443855 has 12 divisors (see below), whose sum is σ = 8500296. Its totient is φ = 4686000.

The previous prime is 6443839. The next prime is 6443863. The reversal of 6443855 is 5583446.

It is not a de Polignac number, because 6443855 - 2⁴ = 6443839 is a prime.

It is a super-2 number, since 2×6443855² = 83046534522050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4721 + ... + 5930.

It is an arithmetic number, because the mean of its divisors is an integer number (708358).

Almost surely, 2^6443855 is an apocalyptic number.

6443855 is a deficient number, since it is larger than the sum of its proper divisors (2056441).

6443855 is a wasteful number, since it uses less digits than its factorization.

6443855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10678 (or 10667 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The square root of 6443855 is about 2538.4749358621. The cubic root of 6443855 is about 186.0866652049.

The spelling of 6443855 in words is "six million, four hundred forty-three thousand, eight hundred fifty-five".