683945 has 8 divisors (see below), whose sum is σ = 843144. Its totient is φ = 532224.

The previous prime is 683939. The next prime is 683957. The reversal of 683945 is 549386.

It can be written as a sum of positive squares in 4 ways, for example, as 63001 + 620944 = 251^2 + 788^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 683945 - 2¹⁴ = 667561 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 683945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1664 + ... + 2033.

It is an arithmetic number, because the mean of its divisors is an integer number (105393).

2⁶⁸³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

683945 is a deficient number, since it is larger than the sum of its proper divisors (159199).

683945 is a wasteful number, since it uses less digits than its factorization.

683945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739.

The product of its digits is 25920, while the sum is 35.

The square root of 683945 is about 827.0096734622. The cubic root of 683945 is about 88.1063194983.

The spelling of 683945 in words is "six hundred eighty-three thousand, nine hundred forty-five".