1340244397 has 2 divisors, whose sum is σ = 1340244398. Its totient is φ = 1340244396.

The previous prime is 1340244383. The next prime is 1340244457. The reversal of 1340244397 is 7934420431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 896762916 + 443481481 = 29946^2 + 21059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340244397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340844397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670122198 + 670122199.

It is an arithmetic number, because the mean of its divisors is an integer number (670122199).

Almost surely, 2^1340244397 is an apocalyptic number.

It is an amenable number.

1340244397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340244397 is an equidigital number, since it uses as much as digits as its factorization.

1340244397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 1340244397 is about 36609.3484918811. The cubic root of 1340244397 is about 1102.5407925699.

The spelling of 1340244397 in words is "one billion, three hundred forty million, two hundred forty-four thousand, three hundred ninety-seven".