343400209 has 2 divisors, whose sum is σ = 343400210. Its totient is φ = 343400208.

The previous prime is 343400207. The next prime is 343400261. The reversal of 343400209 is 902004343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327718609 + 15681600 = 18103^2 + 3960^2 .

It is a cyclic number.

It is not a de Polignac number, because 343400209 - 2¹ = 343400207 is a prime.

Together with 343400207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (343400201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171700104 + 171700105.

It is an arithmetic number, because the mean of its divisors is an integer number (171700105).

Almost surely, 2^343400209 is an apocalyptic number.

It is an amenable number.

343400209 is a deficient number, since it is larger than the sum of its proper divisors (1).

343400209 is an equidigital number, since it uses as much as digits as its factorization.

343400209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 343400209 is about 18531.0606550192. The cubic root of 343400209 is about 700.2721452024.

The spelling of 343400209 in words is "three hundred forty-three million, four hundred thousand, two hundred nine".