1340144305 has 4 divisors (see below), whose sum is σ = 1608173172. Its totient is φ = 1072115440.

The previous prime is 1340144303. The next prime is 1340144341. The reversal of 1340144305 is 5034410431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5034410431 = 39139 ⋅128629.

It can be written as a sum of positive squares in 2 ways, for example, as 912523264 + 427621041 = 30208^2 + 20679^2 .

It is not a de Polignac number, because 1340144305 - 2¹ = 1340144303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340144305.

It is not an unprimeable number, because it can be changed into a prime (1340144303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134014426 + ... + 134014435.

It is an arithmetic number, because the mean of its divisors is an integer number (402043293).

Almost surely, 2^1340144305 is an apocalyptic number.

It is an amenable number.

1340144305 is a deficient number, since it is larger than the sum of its proper divisors (268028867).

1340144305 is an equidigital number, since it uses as much as digits as its factorization.

1340144305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268028866.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1340144305 is about 36607.9814384787. The cubic root of 1340144305 is about 1102.5133452724.

Adding to 1340144305 its reverse (5034410431), we get a palindrome (6374554736).

The spelling of 1340144305 in words is "one billion, three hundred forty million, one hundred forty-four thousand, three hundred five".