1340040043 has 2 divisors, whose sum is σ = 1340040044. Its totient is φ = 1340040042.

The previous prime is 1340040041. The next prime is 1340040061. The reversal of 1340040043 is 3400400431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340040043 - 2¹ = 1340040041 is a prime.

Together with 1340040041, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1340040043.

It is not a weakly prime, because it can be changed into another prime (1340040041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670020021 + 670020022.

It is an arithmetic number, because the mean of its divisors is an integer number (670020022).

Almost surely, 2^1340040043 is an apocalyptic number.

1340040043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340040043 is an equidigital number, since it uses as much as digits as its factorization.

1340040043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1340040043 is about 36606.5573770602. The cubic root of 1340040043 is about 1102.4847530213.

Adding to 1340040043 its reverse (3400400431), we get a palindrome (4740440474).

The spelling of 1340040043 in words is "one billion, three hundred forty million, forty thousand, forty-three".