340389 has 16 divisors (see below), whose sum is σ = 576640. Its totient is φ = 194400.

The previous prime is 340387. The next prime is 340393. The reversal of 340389 is 983043.

It is not a de Polignac number, because 340389 - 2¹ = 340387 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340381) 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, 712 + ... + 1089.

It is an arithmetic number, because the mean of its divisors is an integer number (36040).

2³⁴⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

340389 is a deficient number, since it is larger than the sum of its proper divisors (236251).

340389 is a wasteful number, since it uses less digits than its factorization.

340389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 340389 is about 583.4286588778. The cubic root of 340389 is about 69.8219283434.

It can be divided in two parts, 340 and 389, that added together give a 6-th power (729 = 3⁶).

The spelling of 340389 in words is "three hundred forty thousand, three hundred eighty-nine".