1311227840 has 56 divisors (see below), whose sum is σ = 3362553600. Its totient is φ = 484144128.

The previous prime is 1311227831. The next prime is 1311227873. The reversal of 1311227840 is 487221131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153440 + ... + 161759.

It is an arithmetic number, because the mean of its divisors is an integer number (60045600).

Almost surely, 2^1311227840 is an apocalyptic number.

1311227840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311227840 is an abundant number, since it is smaller than the sum of its proper divisors (2051325760).

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

1311227840 is a wasteful number, since it uses less digits than its factorization.

1311227840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315229 (or 315219 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1311227840 is about 36210.8801329103. The cubic root of 1311227840 is about 1094.5259278222.

Adding to 1311227840 its reverse (487221131), we get a palindrome (1798448971).

The spelling of 1311227840 in words is "one billion, three hundred eleven million, two hundred twenty-seven thousand, eight hundred forty".