445663 has 4 divisors (see below), whose sum is σ = 447408. Its totient is φ = 443920.

The previous prime is 445657. The next prime is 445691. The reversal of 445663 is 366544.

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 445663 - 2⁵ = 445631 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445633) 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, 406 + ... + 1027.

It is an arithmetic number, because the mean of its divisors is an integer number (111852).

2⁴⁴⁵⁶⁶³ is an apocalyptic number.

445663 is a deficient number, since it is larger than the sum of its proper divisors (1745).

445663 is a wasteful number, since it uses less digits than its factorization.

445663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744.

The product of its digits is 8640, while the sum is 28.

The square root of 445663 is about 667.5799577579. The cubic root of 445663 is about 76.3839640878.

The spelling of 445663 in words is "four hundred forty-five thousand, six hundred sixty-three".