1311441840 has 280 divisors, whose sum is σ = 4635194400. Its totient is φ = 344881152.

The previous prime is 1311441823. The next prime is 1311441841. The reversal of 1311441840 is 481441131.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1311441841) 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 55 ways as a sum of consecutive naturals, for example, 6590061 + ... + 6590259.

Almost surely, 2^1311441840 is an apocalyptic number.

1311441840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311441840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2317597200).

1311441840 is an abundant number, since it is smaller than the sum of its proper divisors (3323752560).

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

1311441840 is a wasteful number, since it uses less digits than its factorization.

1311441840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1311441840 is about 36213.8349253431. The cubic root of 1311441840 is about 1094.5854689129.

Adding to 1311441840 its reverse (481441131), we get a palindrome (1792882971).

The spelling of 1311441840 in words is "one billion, three hundred eleven million, four hundred forty-one thousand, eight hundred forty".