320130440 has 64 divisors (see below), whose sum is σ = 836732160. Its totient is φ = 107953920.

The previous prime is 320130431. The next prime is 320130511. The reversal of 320130440 is 44031023.

It is a super-2 number, since 2×320130440² = 204966997229187200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7709 + ... + 26451.

It is an arithmetic number, because the mean of its divisors is an integer number (13073940).

Almost surely, 2^320130440 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 320130440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418366080).

320130440 is an abundant number, since it is smaller than the sum of its proper divisors (516601720).

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

320130440 is a wasteful number, since it uses less digits than its factorization.

320130440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18822 (or 18818 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 320130440 is about 17892.1893573704. The cubic root of 320130440 is about 684.0833032384.

Adding to 320130440 its reverse (44031023), we get a palindrome (364161463).

The spelling of 320130440 in words is "three hundred twenty million, one hundred thirty thousand, four hundred forty".