439880644 has 72 divisors (see below), whose sum is σ = 958624632. Its totient is φ = 175472640.

The previous prime is 439880641. The next prime is 439880653. The reversal of 439880644 is 446088934.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 47444544 + 392436100 = 6888^2 + 19810^2 .

It is a junction number, because it is equal to n+sod(n) for n = 439880594 and 439880603.

It is not an unprimeable number, because it can be changed into a prime (439880641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 322524 + ... + 323884.

It is an arithmetic number, because the mean of its divisors is an integer number (13314231).

Almost surely, 2^439880644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 439880644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479312316).

439880644 is an abundant number, since it is smaller than the sum of its proper divisors (518743988).

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

439880644 is a wasteful number, since it uses less digits than its factorization.

439880644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 439880644 is about 20973.3317334180. The cubic root of 439880644 is about 760.5217124185.

The spelling of 439880644 in words is "four hundred thirty-nine million, eight hundred eighty thousand, six hundred forty-four".