1313240320 has 144 divisors (see below), whose sum is σ = 3634460928. Its totient is φ = 445317120.

The previous prime is 1313240261. The next prime is 1313240333. The reversal of 1313240320 is 230423131.

It is a congruent number.

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, 868365 + ... + 869875.

It is an arithmetic number, because the mean of its divisors is an integer number (25239312).

Almost surely, 2^1313240320 is an apocalyptic number.

1313240320 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 1313240320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1817230464).

1313240320 is an abundant number, since it is smaller than the sum of its proper divisors (2321220608).

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

1313240320 is an equidigital number, since it uses as much as digits as its factorization.

1313240320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636 (or 1622 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1313240320 is about 36238.6578117899. The cubic root of 1313240320 is about 1095.0856031435.

Adding to 1313240320 its reverse (230423131), we get a palindrome (1543663451).

The spelling of 1313240320 in words is "one billion, three hundred thirteen million, two hundred forty thousand, three hundred twenty".