673421 has 8 divisors (see below), whose sum is σ = 815040. Its totient is φ = 543168.

The previous prime is 673411. The next prime is 673427. The reversal of 673421 is 124376.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673421 is a prime.

It is a Duffinian number.

It is a Curzon 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 673421.

It is not an unprimeable number, because it can be changed into a prime (673427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711 + ... + 2948.

It is an arithmetic number, because the mean of its divisors is an integer number (101880).

2⁶⁷³⁴²¹ is an apocalyptic number.

It is an amenable number.

673421 is a deficient number, since it is larger than the sum of its proper divisors (141619).

673421 is a wasteful number, since it uses less digits than its factorization.

673421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683.

The product of its digits is 1008, while the sum is 23.

The square root of 673421 is about 820.6223248243. The cubic root of 673421 is about 87.6520783859.

Adding to 673421 its reverse (124376), we get a palindrome (797797).

The spelling of 673421 in words is "six hundred seventy-three thousand, four hundred twenty-one".