1340071409 has 2 divisors, whose sum is σ = 1340071410. Its totient is φ = 1340071408.

The previous prime is 1340071357. The next prime is 1340071457. The reversal of 1340071409 is 9041700431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1056250000 + 283821409 = 32500^2 + 16847^2 .

It is an emirp because it is prime and its reverse (9041700431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340071409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340071009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670035704 + 670035705.

It is an arithmetic number, because the mean of its divisors is an integer number (670035705).

Almost surely, 2^1340071409 is an apocalyptic number.

It is an amenable number.

1340071409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340071409 is an equidigital number, since it uses as much as digits as its factorization.

1340071409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1340071409 is about 36606.9857950638. The cubic root of 1340071409 is about 1102.4933548207.

The spelling of 1340071409 in words is "one billion, three hundred forty million, seventy-one thousand, four hundred nine".