673709 has 4 divisors (see below), whose sum is σ = 675804. Its totient is φ = 671616.

The previous prime is 673669. The next prime is 673747. The reversal of 673709 is 907376.

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 570025 + 103684 = 755^2 + 322^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673769) 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, 452 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (168951).

2⁶⁷³⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

673709 is a deficient number, since it is larger than the sum of its proper divisors (2095).

673709 is a wasteful number, since it uses less digits than its factorization.

673709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 673709 is about 820.7977826481. The cubic root of 673709 is about 87.6645719082.

The spelling of 673709 in words is "six hundred seventy-three thousand, seven hundred nine".