340321 has 2 divisors, whose sum is σ = 340322. Its totient is φ = 340320.

The previous prime is 340297. The next prime is 340337. The reversal of 340321 is 123043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314721 + 25600 = 561^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 340321 - 2¹⁷ = 209249 is a prime.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 340321.

It is not a weakly prime, because it can be changed into another prime (340381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170160 + 170161.

It is an arithmetic number, because the mean of its divisors is an integer number (170161).

2³⁴⁰³²¹ is an apocalyptic number.

It is an amenable number.

340321 is a deficient number, since it is larger than the sum of its proper divisors (1).

340321 is an equidigital number, since it uses as much as digits as its factorization.

340321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 340321 is about 583.3703797760. The cubic root of 340321 is about 69.8172785581.

Adding to 340321 its reverse (123043), we get a palindrome (463364).

The spelling of 340321 in words is "three hundred forty thousand, three hundred twenty-one", and thus it is an iban number.