340909 has 2 divisors, whose sum is σ = 340910. Its totient is φ = 340908.

The previous prime is 340903. The next prime is 340913. The reversal of 340909 is 909043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198025 + 142884 = 445^2 + 378^2 .

It is an emirp because it is prime and its reverse (909043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340909 - 2⁵ = 340877 is a prime.

340909 is a modest number, since divided by 909 gives 34 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340903) 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, 170454 + 170455.

It is an arithmetic number, because the mean of its divisors is an integer number (170455).

2³⁴⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

340909 is a deficient number, since it is larger than the sum of its proper divisors (1).

340909 is an equidigital number, since it uses as much as digits as its factorization.

340909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 340909 is about 583.8741302712. The cubic root of 340909 is about 69.8574650675.

The spelling of 340909 in words is "three hundred forty thousand, nine hundred nine".