1311443320 has 32 divisors (see below), whose sum is σ = 3218998320. Its totient is φ = 476888320.

The previous prime is 1311443311. The next prime is 1311443339. The reversal of 1311443320 is 233441131.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1311443291 and 1311443300.

It is a congruent number.

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, 1489837 + ... + 1490716.

Almost surely, 2^1311443320 is an apocalyptic number.

1311443320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311443320 is an abundant number, since it is smaller than the sum of its proper divisors (1907555000).

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

1311443320 is a wasteful number, since it uses less digits than its factorization.

1311443320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980575 (or 2980571 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1311443320 is about 36213.8553595167. The cubic root of 1311443320 is about 1094.5858806699.

Adding to 1311443320 its reverse (233441131), we get a palindrome (1544884451).

The spelling of 1311443320 in words is "one billion, three hundred eleven million, four hundred forty-three thousand, three hundred twenty".