673909 has 4 divisors (see below), whose sum is σ = 695680. Its totient is φ = 652140.

The previous prime is 673891. The next prime is 673921. The reversal of 673909 is 909376.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 673909 - 2⁷ = 673781 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 (673979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10839 + ... + 10900.

It is an arithmetic number, because the mean of its divisors is an integer number (173920).

2⁶⁷³⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

673909 is a deficient number, since it is larger than the sum of its proper divisors (21771).

673909 is a wasteful number, since it uses less digits than its factorization.

673909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21770.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 673909 is about 820.9196062953. The cubic root of 673909 is about 87.6732458706.

The spelling of 673909 in words is "six hundred seventy-three thousand, nine hundred nine".