439638 has 16 divisors (see below), whose sum is σ = 898560. Its totient is φ = 143336.

The previous prime is 439631. The next prime is 439639. The reversal of 439638 is 836934.

It is a junction number, because it is equal to n+sod(n) for n = 439599 and 439608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439631) by changing a digit.

439638 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 7 ways as a sum of consecutive naturals, for example, 498 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (56160).

2⁴³⁹⁶³⁸ is an apocalyptic number.

439638 is an abundant number, since it is smaller than the sum of its proper divisors (458922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

439638 is a wasteful number, since it uses less digits than its factorization.

439638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611.

The product of its digits is 15552, while the sum is 33.

The square root of 439638 is about 663.0520341572. The cubic root of 439638 is about 76.0381848743.

It can be divided in two parts, 439 and 638, that multiplied together give a palindrome (280082).

The spelling of 439638 in words is "four hundred thirty-nine thousand, six hundred thirty-eight".