439666 has 8 divisors (see below), whose sum is σ = 662400. Its totient is φ = 218868.

The previous prime is 439661. The next prime is 439667. The reversal of 439666 is 666934.

439666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (439661) by changing a digit.

439666 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435 + ... + 1033.

It is an arithmetic number, because the mean of its divisors is an integer number (82800).

2⁴³⁹⁶⁶⁶ is an apocalyptic number.

439666 is a deficient number, since it is larger than the sum of its proper divisors (222734).

439666 is a wasteful number, since it uses less digits than its factorization.

439666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its digits is 23328, while the sum is 34.

The square root of 439666 is about 663.0731483027. The cubic root of 439666 is about 76.0397990993.

The spelling of 439666 in words is "four hundred thirty-nine thousand, six hundred sixty-six".