340840 has 16 divisors (see below), whose sum is σ = 766980. Its totient is φ = 136320.

The previous prime is 340819. The next prime is 340849. The reversal of 340840 is 48043.

It can be written as a sum of positive squares in 2 ways, for example, as 338724 + 2116 = 582^2 + 46^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4221 + ... + 4300.

2³⁴⁰⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

340840 is an abundant number, since it is smaller than the sum of its proper divisors (426140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

340840 is a wasteful number, since it uses less digits than its factorization.

340840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532 (or 8528 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 340840 is about 583.8150392033. The cubic root of 340840 is about 69.8527516979.

Adding to 340840 its reverse (48043), we get a palindrome (388883).

The spelling of 340840 in words is "three hundred forty thousand, eight hundred forty".