6446443 has 4 divisors (see below), whose sum is σ = 6568128. Its totient is φ = 6324760.

The previous prime is 6446437. The next prime is 6446459. The reversal of 6446443 is 3446446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3446446 = 2 ⋅1723223.

It is a cyclic number.

It is not a de Polignac number, because 6446443 - 2¹³ = 6438251 is a prime.

It is a Duffinian number.

6446443 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6446413) 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, 60763 + ... + 60868.

It is an arithmetic number, because the mean of its divisors is an integer number (1642032).

Almost surely, 2^6446443 is an apocalyptic number.

6446443 is a deficient number, since it is larger than the sum of its proper divisors (121685).

6446443 is a wasteful number, since it uses less digits than its factorization.

6446443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121684.

The product of its digits is 27648, while the sum is 31.

The square root of 6446443 is about 2538.9846395754. The cubic root of 6446443 is about 186.1115740952. Note that the first 3 decimals are identical.

It can be divided in two parts, 6446 and 443, that added together give a square (6889 = 83²).

The spelling of 6446443 in words is "six million, four hundred forty-six thousand, four hundred forty-three".