340809 has 8 divisors (see below), whose sum is σ = 519360. Its totient is φ = 194736.

The previous prime is 340801. The next prime is 340811. The reversal of 340809 is 908043.

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

It is not a de Polignac number, because 340809 - 2³ = 340801 is a prime.

340809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (340801) 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, 8094 + ... + 8135.

It is an arithmetic number, because the mean of its divisors is an integer number (64920).

2³⁴⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

340809 is a deficient number, since it is larger than the sum of its proper divisors (178551).

340809 is a wasteful number, since it uses less digits than its factorization.

340809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16239.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 340809 is about 583.7884890952. The cubic root of 340809 is about 69.8506338900.

The spelling of 340809 in words is "three hundred forty thousand, eight hundred nine".