1311348440 has 16 divisors (see below), whose sum is σ = 2950534080. Its totient is φ = 524539360.

The previous prime is 1311348433. The next prime is 1311348443. The reversal of 1311348440 is 448431131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311348443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16391816 + ... + 16391895.

It is an arithmetic number, because the mean of its divisors is an integer number (184408380).

Almost surely, 2^1311348440 is an apocalyptic number.

1311348440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311348440 is an abundant number, since it is smaller than the sum of its proper divisors (1639185640).

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

1311348440 is a wasteful number, since it uses less digits than its factorization.

1311348440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32783722 (or 32783718 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1311348440 is about 36212.5453399785. The cubic root of 1311348440 is about 1094.5594830840.

Adding to 1311348440 its reverse (448431131), we get a palindrome (1759779571).

The spelling of 1311348440 in words is "one billion, three hundred eleven million, three hundred forty-eight thousand, four hundred forty".