683729 has 4 divisors (see below), whose sum is σ = 685476. Its totient is φ = 681984.

The previous prime is 683719. The next prime is 683731. The reversal of 683729 is 927386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927386 = 2 ⋅463693.

It can be written as a sum of positive squares in 2 ways, for example, as 483025 + 200704 = 695^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 683729 - 2⁴ = 683713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (683719) 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, 17 + ... + 1169.

It is an arithmetic number, because the mean of its divisors is an integer number (171369).

2⁶⁸³⁷²⁹ is an apocalyptic number.

It is an amenable number.

683729 is a deficient number, since it is larger than the sum of its proper divisors (1747).

683729 is a wasteful number, since it uses less digits than its factorization.

683729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746.

The product of its digits is 18144, while the sum is 35.

The square root of 683729 is about 826.8790721744. The cubic root of 683729 is about 88.0970434265.

The spelling of 683729 in words is "six hundred eighty-three thousand, seven hundred twenty-nine".