340645309 has 2 divisors, whose sum is σ = 340645310. Its totient is φ = 340645308.

The previous prime is 340645241. The next prime is 340645313. The reversal of 340645309 is 903546043.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316733209 + 23912100 = 17797^2 + 4890^2 .

It is a cyclic number.

It is not a de Polignac number, because 340645309 - 2¹³ = 340637117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340645379) 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, 170322654 + 170322655.

It is an arithmetic number, because the mean of its divisors is an integer number (170322655).

Almost surely, 2^340645309 is an apocalyptic number.

It is an amenable number.

340645309 is a deficient number, since it is larger than the sum of its proper divisors (1).

340645309 is an equidigital number, since it uses as much as digits as its factorization.

340645309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 340645309 is about 18456.5790167084. The cubic root of 340645309 is about 698.3944898274.

The spelling of 340645309 in words is "three hundred forty million, six hundred forty-five thousand, three hundred nine".