683840 has 28 divisors (see below), whose sum is σ = 1629156. Its totient is φ = 273408.

The previous prime is 683833. The next prime is 683843. The reversal of 683840 is 48386.

It can be written as a sum of positive squares in 2 ways, for example, as 118336 + 565504 = 344^2 + 752^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683843) by changing a digit.

683840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749 + ... + 1388.

2⁶⁸³⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

683840 is an abundant number, since it is smaller than the sum of its proper divisors (945316).

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

683840 is a wasteful number, since it uses less digits than its factorization.

683840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154 (or 2144 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 683840 is about 826.9461893013. The cubic root of 683840 is about 88.1018105408.

The spelling of 683840 in words is "six hundred eighty-three thousand, eight hundred forty".