1340749 has 2 divisors, whose sum is σ = 1340750. Its totient is φ = 1340748.

The previous prime is 1340747. The next prime is 1340753. The reversal of 1340749 is 9470431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1334025 + 6724 = 1155^2 + 82^2 .

It is an emirp because it is prime and its reverse (9470431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1340749 - 2¹ = 1340747 is a prime.

Together with 1340747, it forms a pair of twin primes.

It is a congruent number.

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, 670374 + 670375.

It is an arithmetic number, because the mean of its divisors is an integer number (670375).

2^1340749 is an apocalyptic number.

It is an amenable number.

1340749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340749 is an equidigital number, since it uses as much as digits as its factorization.

1340749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1340749 is about 1157.9071638089. The cubic root of 1340749 is about 110.2679144348.

It can be divided in two parts, 13407 and 49, that added together give a square (13456 = 116²).

The spelling of 1340749 in words is "one million, three hundred forty thousand, seven hundred forty-nine".