1311223403440 has 20 divisors (see below), whose sum is σ = 3048594413184. Its totient is φ = 524489361344.

The previous prime is 1311223403423. The next prime is 1311223403467. The reversal of 1311223403440 is 443043221131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1311223403399 and 1311223403408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8195146192 + ... + 8195146351.

Almost surely, 2^{1311223403440} is an apocalyptic number.

1311223403440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311223403440 is an abundant number, since it is smaller than the sum of its proper divisors (1737371009744).

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

1311223403440 is a wasteful number, since it uses less digits than its factorization.

1311223403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390292556 (or 16390292550 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1311223403440 its reverse (443043221131), we get a palindrome (1754266624571).

The spelling of 1311223403440 in words is "one trillion, three hundred eleven billion, two hundred twenty-three million, four hundred three thousand, four hundred forty".