1304320 has 36 divisors (see below), whose sum is σ = 3127320. Its totient is φ = 521216.

The previous prime is 1304309. The next prime is 1304321. The reversal of 1304320 is 234031.

It is a self number, because there is not a number n which added to its sum of digits gives 1304320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771 + ... + 1789.

It is an arithmetic number, because the mean of its divisors is an integer number (86870).

2^1304320 is an apocalyptic number.

1304320 is a gapful number since it is divisible by the number (10) 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 1304320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1563660).

1304320 is an abundant number, since it is smaller than the sum of its proper divisors (1823000).

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

1304320 is an equidigital number, since it uses as much as digits as its factorization.

1304320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 1304320 is about 1142.0682991835. The cubic root of 1304320 is about 109.2600473909.

Adding to 1304320 its reverse (234031), we get a palindrome (1538351).

The spelling of 1304320 in words is "one million, three hundred four thousand, three hundred twenty".