1340444345 has 4 divisors (see below), whose sum is σ = 1608533220. Its totient is φ = 1072355472.

The previous prime is 1340444341. The next prime is 1340444353. The reversal of 1340444345 is 5434440431.

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 646227241 + 694217104 = 25421^2 + 26348^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340444345 - 2² = 1340444341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1340444341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134044430 + ... + 134044439.

It is an arithmetic number, because the mean of its divisors is an integer number (402133305).

Almost surely, 2^1340444345 is an apocalyptic number.

It is an amenable number.

1340444345 is a deficient number, since it is larger than the sum of its proper divisors (268088875).

1340444345 is an equidigital number, since it uses as much as digits as its factorization.

1340444345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268088874.

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 1340444345 is about 36612.0792225735. The cubic root of 1340444345 is about 1102.5956183577.

Adding to 1340444345 its reverse (5434440431), we get a palindrome (6774884776).

The spelling of 1340444345 in words is "one billion, three hundred forty million, four hundred forty-four thousand, three hundred forty-five".