1311387396 has 48 divisors (see below), whose sum is σ = 3344882688. Its totient is φ = 396580000.

The previous prime is 1311387359. The next prime is 1311387397. The reversal of 1311387396 is 6937831131.

It is not an unprimeable number, because it can be changed into a prime (1311387397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56521 + ... + 76271.

It is an arithmetic number, because the mean of its divisors is an integer number (69685056).

Almost surely, 2^1311387396 is an apocalyptic number.

It is an amenable number.

1311387396 is an abundant number, since it is smaller than the sum of its proper divisors (2033495292).

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

1311387396 is a wasteful number, since it uses less digits than its factorization.

1311387396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20272 (or 20270 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 1311387396 is about 36213.0832158766. The cubic root of 1311387396 is about 1094.5703216060.

The spelling of 1311387396 in words is "one billion, three hundred eleven million, three hundred eighty-seven thousand, three hundred ninety-six".