1340447 has 2 divisors, whose sum is σ = 1340448. Its totient is φ = 1340446.

The previous prime is 1340441. The next prime is 1340459. The reversal of 1340447 is 7440431.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340447 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340441) 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, 670223 + 670224.

It is an arithmetic number, because the mean of its divisors is an integer number (670224).

2^1340447 is an apocalyptic number.

1340447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340447 is an equidigital number, since it uses as much as digits as its factorization.

1340447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 1340447 is about 1157.7767487733. The cubic root of 1340447 is about 110.2596346323.

Adding to 1340447 its reverse (7440431), we get a palindrome (8780878).

The spelling of 1340447 in words is "one million, three hundred forty thousand, four hundred forty-seven".