439640 has 32 divisors (see below), whose sum is σ = 1026000. Its totient is φ = 169344.

The previous prime is 439639. The next prime is 439661. The reversal of 439640 is 46934.

439640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 971 + ... + 1349.

2⁴³⁹⁶⁴⁰ is an apocalyptic number.

439640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 439640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (513000).

439640 is an abundant number, since it is smaller than the sum of its proper divisors (586360).

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

439640 is a wasteful number, since it uses less digits than its factorization.

439640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 415 counting only the distinct ones).

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

The square root of 439640 is about 663.0535423327. The cubic root of 439640 is about 76.0383001783.

The spelling of 439640 in words is "four hundred thirty-nine thousand, six hundred forty".