340513209 has 9 divisors (see below), whose sum is σ = 491932389. Its totient is φ = 226971900.

The previous prime is 340513189. The next prime is 340513211. The reversal of 340513209 is 902315043.

The square root of 340513209 is 18453.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 340513209 - 2⁵ = 340513177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (340513219) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52284 + ... + 58434.

Almost surely, 2^340513209 is an apocalyptic number.

340513209 is the 18453-rd square number.

340513209 is the 9227-th centered octagonal number.

It is an amenable number.

340513209 is a deficient number, since it is larger than the sum of its proper divisors (151419180).

340513209 is an frugal number, since it uses more digits than its factorization.

340513209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12308 (or 6154 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The cubic root of 340513209 is about 698.3042005658.

The spelling of 340513209 in words is "three hundred forty million, five hundred thirteen thousand, two hundred nine".