1311304340 has 24 divisors (see below), whose sum is σ = 2842570752. Its totient is φ = 507601440.

The previous prime is 1311304321. The next prime is 1311304343. The reversal of 1311304340 is 434031131.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311304343) 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, 1056884 + ... + 1058123.

It is an arithmetic number, because the mean of its divisors is an integer number (118440448).

Almost surely, 2^1311304340 is an apocalyptic number.

1311304340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311304340 is an abundant number, since it is smaller than the sum of its proper divisors (1531266412).

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

1311304340 is a wasteful number, since it uses less digits than its factorization.

1311304340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115047 (or 2115045 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1311304340 is about 36211.9364298569. The cubic root of 1311304340 is about 1094.5472131149.

Adding to 1311304340 its reverse (434031131), we get a palindrome (1745335471).

The spelling of 1311304340 in words is "one billion, three hundred eleven million, three hundred four thousand, three hundred forty".