1340243 has 2 divisors, whose sum is σ = 1340244. Its totient is φ = 1340242.

The previous prime is 1340237. The next prime is 1340281. The reversal of 1340243 is 3420431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1340243 - 2⁶ = 1340179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1340743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670121 + 670122.

It is an arithmetic number, because the mean of its divisors is an integer number (670122).

2^1340243 is an apocalyptic number.

1340243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340243 is an equidigital number, since it uses as much as digits as its factorization.

1340243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 1340243 is about 1157.6886455347. The cubic root of 1340243 is about 110.2540409493.

Adding to 1340243 its reverse (3420431), we get a palindrome (4760674).

The spelling of 1340243 in words is "one million, three hundred forty thousand, two hundred forty-three".