683649 has 12 divisors (see below), whose sum is σ = 1014676. Its totient is φ = 443232.

The previous prime is 683603. The next prime is 683651. The reversal of 683649 is 946386.

683649 is a `hidden beast` number, since 6 + 8 + 3 + 649 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 497025 + 186624 = 705^2 + 432^2 .

It is not a de Polignac number, because 683649 - 2¹³ = 675457 is a prime.

It is a Duffinian number.

It is a Curzon number.

683649 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 683649.

It is not an unprimeable number, because it can be changed into a prime (683699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 694 + ... + 1359.

2⁶⁸³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

683649 is a deficient number, since it is larger than the sum of its proper divisors (331027).

683649 is a wasteful number, since it uses less digits than its factorization.

683649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096 (or 2093 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 683649 is about 826.8306960920. The cubic root of 683649 is about 88.0936073486.

The spelling of 683649 in words is "six hundred eighty-three thousand, six hundred forty-nine".