1311344340 has 48 divisors (see below), whose sum is σ = 3757161408. Its totient is φ = 341558784.

The previous prime is 1311344329. The next prime is 1311344341. The reversal of 1311344340 is 434431131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311344340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311344341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251557 + ... + 256716.

It is an arithmetic number, because the mean of its divisors is an integer number (78274196).

Almost surely, 2^1311344340 is an apocalyptic number.

1311344340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311344340 is an abundant number, since it is smaller than the sum of its proper divisors (2445817068).

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

1311344340 is a wasteful number, since it uses less digits than its factorization.

1311344340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508328 (or 508326 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1311344340 is about 36212.4887297186. The cubic root of 1311344340 is about 1094.5583423502.

Adding to 1311344340 its reverse (434431131), we get a palindrome (1745775471).

The spelling of 1311344340 in words is "one billion, three hundred eleven million, three hundred forty-four thousand, three hundred forty".