1243320320 has 104 divisors (see below), whose sum is σ = 3255431040. Its totient is φ = 452034560.

The previous prime is 1243320319. The next prime is 1243320343. The reversal of 1243320320 is 230233421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1243320292 and 1243320301.

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, 222521 + ... + 228039.

Almost surely, 2^1243320320 is an apocalyptic number.

1243320320 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 1243320320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627715520).

1243320320 is an abundant number, since it is smaller than the sum of its proper divisors (2012110720).

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

1243320320 is an equidigital number, since it uses as much as digits as its factorization.

1243320320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5559 (or 5537 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 1243320320 is about 35260.7475814113. The cubic root of 1243320320 is about 1075.2951257485.

Adding to 1243320320 its reverse (230233421), we get a palindrome (1473553741).

The spelling of 1243320320 in words is "one billion, two hundred forty-three million, three hundred twenty thousand, three hundred twenty".