443661 has 8 divisors (see below), whose sum is σ = 606144. Its totient is φ = 288480.

The previous prime is 443659. The next prime is 443687. The reversal of 443661 is 166344.

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

It is not a de Polignac number, because 443661 - 2¹ = 443659 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

443661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1681 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (75768).

2⁴⁴³⁶⁶¹ is an apocalyptic number.

443661 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

443661 is a deficient number, since it is larger than the sum of its proper divisors (162483).

443661 is a wasteful number, since it uses less digits than its factorization.

443661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3651.

The product of its digits is 1728, while the sum is 24.

The square root of 443661 is about 666.0788241642. The cubic root of 443661 is about 76.2694154625.

The spelling of 443661 in words is "four hundred forty-three thousand, six hundred sixty-one".