340686309 has 8 divisors (see below), whose sum is σ = 456198912. Its totient is φ = 226148960.

The previous prime is 340686293. The next prime is 340686317. The reversal of 340686309 is 903686043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 340686309 - 2⁴ = 340686293 is a prime.

It is a super-2 number, since 2×340686309² = 232134322280086962, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340686349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242997 + ... + 244394.

It is an arithmetic number, because the mean of its divisors is an integer number (57024864).

Almost surely, 2^340686309 is an apocalyptic number.

It is an amenable number.

340686309 is a deficient number, since it is larger than the sum of its proper divisors (115512603).

340686309 is a wasteful number, since it uses less digits than its factorization.

340686309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487627.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 340686309 is about 18457.6896983344. The cubic root of 340686309 is about 698.4225082429.

The spelling of 340686309 in words is "three hundred forty million, six hundred eighty-six thousand, three hundred nine".