340689 has 16 divisors (see below), whose sum is σ = 492800. Its totient is φ = 208656.

The previous prime is 340687. The next prime is 340693. The reversal of 340689 is 986043.

340689 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 340689 - 2¹ = 340687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2382 + ... + 2520.

It is an arithmetic number, because the mean of its divisors is an integer number (30800).

2³⁴⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

340689 is a deficient number, since it is larger than the sum of its proper divisors (152111).

340689 is a wasteful number, since it uses less digits than its factorization.

340689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 340689 is about 583.6857030971. The cubic root of 340689 is about 69.8424347129.

The spelling of 340689 in words is "three hundred forty thousand, six hundred eighty-nine".