1340723 has 2 divisors, whose sum is σ = 1340724. Its totient is φ = 1340722.

The previous prime is 1340707. The next prime is 1340743. The reversal of 1340723 is 3270431.

It is an a-pointer prime, because the next prime (1340743) can be obtained adding 1340723 to its sum of digits (20).

It is a weak prime.

It is an emirp because it is prime and its reverse (3270431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1340723 - 2⁴ = 1340707 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340695 and 1340704.

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, 670361 + 670362.

It is an arithmetic number, because the mean of its divisors is an integer number (670362).

2^1340723 is an apocalyptic number.

1340723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340723 is an equidigital number, since it uses as much as digits as its factorization.

1340723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 1340723 is about 1157.8959366022. The cubic root of 1340723 is about 110.2672016530.

Subtracting from 1340723 its sum of digits (20), we obtain a triangular number (1340703 = T₁₆₃₇).

The spelling of 1340723 in words is "one million, three hundred forty thousand, seven hundred twenty-three".