443906 has 4 divisors (see below), whose sum is σ = 665862. Its totient is φ = 221952.

The previous prime is 443899. The next prime is 443909. The reversal of 443906 is 609344.

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

It can be written as a sum of positive squares in only one way, i.e., 442225 + 1681 = 665^2 + 41^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443909) by changing a digit.

443906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 110975 + ... + 110978.

2⁴⁴³⁹⁰⁶ is an apocalyptic number.

443906 is a deficient number, since it is larger than the sum of its proper divisors (221956).

443906 is a wasteful number, since it uses less digits than its factorization.

443906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221955.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 443906 is about 666.2627109482. The cubic root of 443906 is about 76.2834521318.

The spelling of 443906 in words is "four hundred forty-three thousand, nine hundred six".