6444005 has 8 divisors (see below), whose sum is σ = 7879032. Its totient is φ = 5057728.

The previous prime is 6443999. The next prime is 6444017. The reversal of 6444005 is 5004446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1643524 + 4800481 = 1282^2 + 2191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6444005 - 2¹⁰ = 6442981 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 4⁴ + 4⁷ + 4¹¹ + 0 + 0 + 5⁹ .

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 7 ways as a sum of consecutive naturals, for example, 11894 + ... + 12423.

It is an arithmetic number, because the mean of its divisors is an integer number (984879).

Almost surely, 2^6444005 is an apocalyptic number.

It is an amenable number.

6444005 is a deficient number, since it is larger than the sum of its proper divisors (1435027).

6444005 is a wasteful number, since it uses less digits than its factorization.

6444005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24375.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 6444005 is about 2538.5044809888. The cubic root of 6444005 is about 186.0881091017.

The spelling of 6444005 in words is "six million, four hundred forty-four thousand, five".