439906 has 4 divisors (see below), whose sum is σ = 659862. Its totient is φ = 219952.

The previous prime is 439903. The next prime is 439919. The reversal of 439906 is 609934.

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., 434281 + 5625 = 659^2 + 75^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (439903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109975 + ... + 109978.

2⁴³⁹⁹⁰⁶ is an apocalyptic number.

439906 is a deficient number, since it is larger than the sum of its proper divisors (219956).

439906 is a wasteful number, since it uses less digits than its factorization.

439906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219955.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 439906 is about 663.2540991204. The cubic root of 439906 is about 76.0536325032.

The spelling of 439906 in words is "four hundred thirty-nine thousand, nine hundred six".