1340256959 has 2 divisors, whose sum is σ = 1340256960. Its totient is φ = 1340256958.

The previous prime is 1340256949. The next prime is 1340256961. The reversal of 1340256959 is 9596520431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1340256959 - 2¹⁶ = 1340191423 is a prime.

It is a super-2 number, since 2×1340256959² = 3592577432295855362, which contains 22 as substring.

Together with 1340256961, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340256949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670128479 + 670128480.

It is an arithmetic number, because the mean of its divisors is an integer number (670128480).

Almost surely, 2^1340256959 is an apocalyptic number.

1340256959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340256959 is an equidigital number, since it uses as much as digits as its factorization.

1340256959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 1340256959 is about 36609.5200596785. The cubic root of 1340256959 is about 1102.5442372338.

The spelling of 1340256959 in words is "one billion, three hundred forty million, two hundred fifty-six thousand, nine hundred fifty-nine".