439218820 has 48 divisors (see below), whose sum is σ = 973103040. Its totient is φ = 166064256.

The previous prime is 439218811. The next prime is 439218821. The reversal of 439218820 is 28812934.

It is a self number, because there is not a number n which added to its sum of digits gives 439218820.

It is not an unprimeable number, because it can be changed into a prime (439218821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212914 + ... + 214966.

It is an arithmetic number, because the mean of its divisors is an integer number (20272980).

Almost surely, 2^439218820 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 439218820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486551520).

439218820 is an abundant number, since it is smaller than the sum of its proper divisors (533884220).

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

439218820 is a wasteful number, since it uses less digits than its factorization.

439218820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644 (or 2642 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 439218820 is about 20957.5480436047. The cubic root of 439218820 is about 760.1401057489.

The spelling of 439218820 in words is "four hundred thirty-nine million, two hundred eighteen thousand, eight hundred twenty".