6446 has 8 divisors (see below), whose sum is σ = 10584.
Its totient is φ = 2920.
The previous prime is 6427. The next prime is 6449.
6446 = 192 + 202 + ... + 292.
6446 is nontrivially palindromic in base 10.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a Curzon number.
It is a plaindrome in base 8.
It is a nialpdrome in base 9.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6449) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125 + ... + 168.
It is an arithmetic number, because the mean of its divisors is an integer number (1323).
6446 is a deficient number, since it is larger than the sum of its proper divisors (4138).
6446 is a wasteful number, since it uses less digits than its factorization.
6446 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 306.
The product of its digits is 576, while the sum is 20.
The square root of 6446 is about 80.2869852467.
The cubic root of 6446 is about 18.6107310798.
The spelling of 6446 in words is "six thousand, four hundred forty-six".