1340260391 has 2 divisors, whose sum is σ = 1340260392. Its totient is φ = 1340260390.

The previous prime is 1340260387. The next prime is 1340260477. The reversal of 1340260391 is 1930620431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340260391 - 2² = 1340260387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340260321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670130195 + 670130196.

It is an arithmetic number, because the mean of its divisors is an integer number (670130196).

Almost surely, 2^1340260391 is an apocalyptic number.

1340260391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340260391 is an equidigital number, since it uses as much as digits as its factorization.

1340260391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1340260391 is about 36609.5669327022. The cubic root of 1340260391 is about 1102.5451783291.

The spelling of 1340260391 in words is "one billion, three hundred forty million, two hundred sixty thousand, three hundred ninety-one".