1243313320 has 32 divisors (see below), whose sum is σ = 2798466120. Its totient is φ = 497145600.

The previous prime is 1243313299. The next prime is 1243313327. The reversal of 1243313320 is 233133421.

It can be written as a sum of positive squares in 4 ways, for example, as 956417476 + 286895844 = 30926^2 + 16938^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1243313291 and 1243313300.

It is not an unprimeable number, because it can be changed into a prime (1243313327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194170 + ... + 200470.

Almost surely, 2^1243313320 is an apocalyptic number.

1243313320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243313320 is an abundant number, since it is smaller than the sum of its proper divisors (1555152800).

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

1243313320 is a wasteful number, since it uses less digits than its factorization.

1243313320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11245 (or 11241 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 1243313320 is about 35260.6483207555. The cubic root of 1243313320 is about 1075.2931077435.

Adding to 1243313320 its reverse (233133421), we get a palindrome (1476446741).

The spelling of 1243313320 in words is "one billion, two hundred forty-three million, three hundred thirteen thousand, three hundred twenty".