1340568641 has 4 divisors (see below), whose sum is σ = 1355631300. Its totient is φ = 1325505984.

The previous prime is 1340568637. The next prime is 1340568659. The reversal of 1340568641 is 1468650431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 778689025 + 561879616 = 27905^2 + 23704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340568641 - 2² = 1340568637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1340568595 and 1340568604.

It is not an unprimeable number, because it can be changed into a prime (1340568601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7531196 + ... + 7531373.

It is an arithmetic number, because the mean of its divisors is an integer number (338907825).

Almost surely, 2^1340568641 is an apocalyptic number.

It is an amenable number.

1340568641 is a deficient number, since it is larger than the sum of its proper divisors (15062659).

1340568641 is an equidigital number, since it uses as much as digits as its factorization.

1340568641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15062658.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 1340568641 is about 36613.7766557890. The cubic root of 1340568641 is about 1102.6296976015.

The spelling of 1340568641 in words is "one billion, three hundred forty million, five hundred sixty-eight thousand, six hundred forty-one".