6444813 has 8 divisors (see below), whose sum is σ = 8676928. Its totient is φ = 4254624.

The previous prime is 6444803. The next prime is 6444827. The reversal of 6444813 is 3184446.

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

It is not a de Polignac number, because 6444813 - 2¹⁶ = 6379277 is a prime.

It is a super-2 number, since 2×6444813² = 83071229209938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10120 + ... + 10737.

It is an arithmetic number, because the mean of its divisors is an integer number (1084616).

Almost surely, 2^6444813 is an apocalyptic number.

It is an amenable number.

6444813 is a deficient number, since it is larger than the sum of its proper divisors (2232115).

6444813 is a wasteful number, since it uses less digits than its factorization.

6444813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20963.

The product of its digits is 9216, while the sum is 30.

The square root of 6444813 is about 2538.6636248231. The cubic root of 6444813 is about 186.0958865066.

The spelling of 6444813 in words is "six million, four hundred forty-four thousand, eight hundred thirteen".