6405844 has 12 divisors (see below), whose sum is σ = 11276244. Its totient is φ = 3184064.

The previous prime is 6405829. The next prime is 6405877. The reversal of 6405844 is 4485046.

It can be written as a sum of positive squares in 2 ways, for example, as 3027600 + 3378244 = 1740^2 + 1838^2 .

It is a super-3 number, since 3×6405844³ (a number of 21 digits) contains 333 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3937 + ... + 5320.

It is an arithmetic number, because the mean of its divisors is an integer number (939687).

Almost surely, 2^6405844 is an apocalyptic number.

It is an amenable number.

6405844 is a deficient number, since it is larger than the sum of its proper divisors (4870400).

6405844 is a wasteful number, since it uses less digits than its factorization.

6405844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434 (or 9432 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 6405844 is about 2530.9768865005. The cubic root of 6405844 is about 185.7200474966.

The spelling of 6405844 in words is "six million, four hundred five thousand, eight hundred forty-four".