340415209 has 2 divisors, whose sum is σ = 340415210. Its totient is φ = 340415208.

The previous prime is 340415189. The next prime is 340415213. The reversal of 340415209 is 902514043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338376025 + 2039184 = 18395^2 + 1428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340415209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (340415239) 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, 170207604 + 170207605.

It is an arithmetic number, because the mean of its divisors is an integer number (170207605).

Almost surely, 2^340415209 is an apocalyptic number.

It is an amenable number.

340415209 is a deficient number, since it is larger than the sum of its proper divisors (1).

340415209 is an equidigital number, since it uses as much as digits as its factorization.

340415209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 340415209 is about 18450.3444141295. The cubic root of 340415209 is about 698.2372032844.

The spelling of 340415209 in words is "three hundred forty million, four hundred fifteen thousand, two hundred nine".