4445 has 8 divisors (see below), whose sum is σ = 6144. Its totient is φ = 3024.

The previous prime is 4441. The next prime is 4447. The reversal of 4445 is 5444.

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

It is not a de Polignac number, because 4445 - 2² = 4441 is a prime.

It is a magnanimous number.

It is a Duffinian number.

It is a plaindrome in base 10 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4441) 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 7 ways as a sum of consecutive naturals, for example, 29 + ... + 98.

It is an arithmetic number, because the mean of its divisors is an integer number (768).

It is an amenable number.

4445 is a deficient number, since it is larger than the sum of its proper divisors (1699).

4445 is a wasteful number, since it uses less digits than its factorization.

4445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139.

The product of its digits is 320, while the sum is 17.

The square root of 4445 is about 66.6708332031. The cubic root of 4445 is about 16.4420988592.

Adding to 4445 its reverse (5444), we get a palindrome (9889).

Subtracting 4445 from its reverse (5444), we obtain a palindrome (999).

The spelling of 4445 in words is "four thousand, four hundred forty-five".