340445309 has 2 divisors, whose sum is σ = 340445310. Its totient is φ = 340445308.

The previous prime is 340445279. The next prime is 340445327. The reversal of 340445309 is 903544043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202265284 + 138180025 = 14222^2 + 11755^2 .

It is an emirp because it is prime and its reverse (903544043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340445309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340445359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170222654 + 170222655.

It is an arithmetic number, because the mean of its divisors is an integer number (170222655).

Almost surely, 2^340445309 is an apocalyptic number.

It is an amenable number.

340445309 is a deficient number, since it is larger than the sum of its proper divisors (1).

340445309 is an equidigital number, since it uses as much as digits as its factorization.

340445309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 340445309 is about 18451.1600990290. The cubic root of 340445309 is about 698.2577823888.

The spelling of 340445309 in words is "three hundred forty million, four hundred forty-five thousand, three hundred nine".