445 has 4 divisors (see below), whose sum is σ = 540. Its totient is φ = 352.

The previous prime is 443. The next prime is 449. The reversal of 445 is 544.

Adding to 445 its product of digits (80), we get a palindrome (525).

Adding to 445 its reverse (544), we get a palindrome (989).

Subtracting 445 from its reverse (544), we obtain a palindrome (99).

It can be divided in two parts, 44 and 5, that added together give a square (49 = 7^{2}).

445 = T_{4} + T_{5} + ... +
T_{13}.

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

It can be written as a sum of positive squares in 2 ways, for example, as 121 + 324 = 11^2 + 18^2 .

It is a cyclic number.

It is not a de Polignac number, because 445 - 2^{1} = 443 is a prime.

It is a d-powerful number, because it can be written as **4**^{3} + **4**^{4} + **5**^{3} .

It is a plaindrome in base 10, base 14 and base 16.

It is a nialpdrome in base 9 and base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443) 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, 40 + ... + 49.

It is an arithmetic number, because the mean of its divisors is an integer number (135).

It is an amenable number.

445 is a deficient number, since it is larger than the sum of its proper divisors (95).

445 is an equidigital number, since it uses as much as digits as its factorization.

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

The sum of its prime factors is 94.

The product of its digits is 80, while the sum is 13.

The square root of 445 is about 21.0950231097. The cubic root of 445 is about 7.6346067215.

The spelling of 445 in words is "four hundred forty-five", and thus it is an aban number.

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