1311020404440 has 64 divisors (see below), whose sum is σ = 4164417761760. Its totient is φ = 329040414720.

The previous prime is 1311020404429. The next prime is 1311020404483. The reversal of 1311020404440 is 444040201131.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1311020404440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321326491 + ... + 321330570.

Almost surely, 2^{1311020404440} is an apocalyptic number.

1311020404440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311020404440 is an abundant number, since it is smaller than the sum of its proper divisors (2853397357320).

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

1311020404440 is a wasteful number, since it uses less digits than its factorization.

1311020404440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642657092 (or 642657088 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1311020404440 its reverse (444040201131), we get a palindrome (1755060605571).

The spelling of 1311020404440 in words is "one trillion, three hundred eleven billion, twenty million, four hundred four thousand, four hundred forty".