1331968840 has 32 divisors (see below), whose sum is σ = 3100275000. Its totient is φ = 514415104.

The previous prime is 1331968829. The next prime is 1331968843. The reversal of 1331968840 is 488691331.

It can be written as a sum of positive squares in 4 ways, for example, as 1276347076 + 55621764 = 35726^2 + 7458^2 .

It is not an unprimeable number, because it can be changed into a prime (1331968843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572965 + ... + 575284.

Almost surely, 2^1331968840 is an apocalyptic number.

1331968840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331968840 is an abundant number, since it is smaller than the sum of its proper divisors (1768306160).

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

1331968840 is a wasteful number, since it uses less digits than its factorization.

1331968840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148289 (or 1148285 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1331968840 is about 36496.1482899223. The cubic root of 1331968840 is about 1100.2668333391.

The spelling of 1331968840 in words is "one billion, three hundred thirty-one million, nine hundred sixty-eight thousand, eight hundred forty".