1340244457 has 2 divisors, whose sum is σ = 1340244458. Its totient is φ = 1340244456.

The previous prime is 1340244397. The next prime is 1340244461. The reversal of 1340244457 is 7544420431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1300251481 + 39992976 = 36059^2 + 6324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340244457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340244557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670122228 + 670122229.

It is an arithmetic number, because the mean of its divisors is an integer number (670122229).

Almost surely, 2^1340244457 is an apocalyptic number.

It is an amenable number.

1340244457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340244457 is an equidigital number, since it uses as much as digits as its factorization.

1340244457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 1340244457 is about 36609.3493113440. The cubic root of 1340244457 is about 1102.5408090228.

Adding to 1340244457 its reverse (7544420431), we get a palindrome (8884664888).

The spelling of 1340244457 in words is "one billion, three hundred forty million, two hundred forty-four thousand, four hundred fifty-seven".