6404443 has 4 divisors (see below), whose sum is σ = 6432640. Its totient is φ = 6376248.

The previous prime is 6404407. The next prime is 6404449. The reversal of 6404443 is 3444046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6404443 - 2²¹ = 4307291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6404449) 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, 13755 + ... + 14212.

It is an arithmetic number, because the mean of its divisors is an integer number (1608160).

Almost surely, 2^6404443 is an apocalyptic number.

6404443 is a deficient number, since it is larger than the sum of its proper divisors (28197).

6404443 is a wasteful number, since it uses less digits than its factorization.

6404443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28196.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 6404443 is about 2530.7001007626. The cubic root of 6404443 is about 185.7065071129.

Adding to 6404443 its reverse (3444046), we get a palindrome (9848489).

The spelling of 6404443 in words is "six million, four hundred four thousand, four hundred forty-three".