6444013 has 4 divisors (see below), whose sum is σ = 6450688. Its totient is φ = 6437340.

The previous prime is 6443999. The next prime is 6444017. The reversal of 6444013 is 3104446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3104446 = 2 ⋅1552223.

It is a cyclic number.

It is not a de Polignac number, because 6444013 - 2⁵ = 6443981 is a prime.

It is a super-3 number, since 3×6444013³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444017) by changing a digit.

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, 1581 + ... + 3922.

It is an arithmetic number, because the mean of its divisors is an integer number (1612672).

Almost surely, 2^6444013 is an apocalyptic number.

It is an amenable number.

6444013 is a deficient number, since it is larger than the sum of its proper divisors (6675).

6444013 is a wasteful number, since it uses less digits than its factorization.

6444013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6674.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 6444013 is about 2538.5060567192. The cubic root of 6444013 is about 186.0881861089.

Adding to 6444013 its reverse (3104446), we get a palindrome (9548459).

The spelling of 6444013 in words is "six million, four hundred forty-four thousand, thirteen".