340509349 has 2 divisors, whose sum is σ = 340509350. Its totient is φ = 340509348.

The previous prime is 340509347. The next prime is 340509353. The reversal of 340509349 is 943905043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339112225 + 1397124 = 18415^2 + 1182^2 .

It is an emirp because it is prime and its reverse (943905043) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 340509349 - 2¹ = 340509347 is a prime.

Together with 340509347, 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 (340509347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170254674 + 170254675.

It is an arithmetic number, because the mean of its divisors is an integer number (170254675).

Almost surely, 2^340509349 is an apocalyptic number.

It is an amenable number.

340509349 is a deficient number, since it is larger than the sum of its proper divisors (1).

340509349 is an equidigital number, since it uses as much as digits as its factorization.

340509349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 340509349 is about 18452.8954096640. The cubic root of 340509349 is about 698.3015619364.

The spelling of 340509349 in words is "three hundred forty million, five hundred nine thousand, three hundred forty-nine".