673021 has 4 divisors (see below), whose sum is σ = 675612. Its totient is φ = 670432.

The previous prime is 673019. The next prime is 673039. The reversal of 673021 is 120376.

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 504100 + 168921 = 710^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 673021 - 2¹ = 673019 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 673021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673091) 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, 856 + ... + 1441.

It is an arithmetic number, because the mean of its divisors is an integer number (168903).

2⁶⁷³⁰²¹ is an apocalyptic number.

It is an amenable number.

673021 is a deficient number, since it is larger than the sum of its proper divisors (2591).

673021 is a wasteful number, since it uses less digits than its factorization.

673021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 673021 is about 820.3785711487. The cubic root of 673021 is about 87.6347203610.

Adding to 673021 its reverse (120376), we get a palindrome (793397).

The spelling of 673021 in words is "six hundred seventy-three thousand, twenty-one".