683845 has 4 divisors (see below), whose sum is σ = 820620. Its totient is φ = 547072.

The previous prime is 683843. The next prime is 683857. The reversal of 683845 is 548386.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 613089 = 266^2 + 783^2 .

It is a cyclic number.

It is not a de Polignac number, because 683845 - 2¹ = 683843 is a prime.

683845 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 683845.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68380 + ... + 68389.

It is an arithmetic number, because the mean of its divisors is an integer number (205155).

2⁶⁸³⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

683845 is a deficient number, since it is larger than the sum of its proper divisors (136775).

683845 is a wasteful number, since it uses less digits than its factorization.

683845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136774.

The product of its digits is 23040, while the sum is 34.

The square root of 683845 is about 826.9492124671. The cubic root of 683845 is about 88.1020252635.

The spelling of 683845 in words is "six hundred eighty-three thousand, eight hundred forty-five".