673521 has 8 divisors (see below), whose sum is σ = 901824. Its totient is φ = 447120.

The previous prime is 673513. The next prime is 673529. The reversal of 673521 is 125376.

673521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (673513) and next prime (673529).

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

It is not a de Polignac number, because 673521 - 2³ = 673513 is a prime.

673521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 673491 and 673500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673529) 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, 1140 + ... + 1626.

It is an arithmetic number, because the mean of its divisors is an integer number (112728).

2⁶⁷³⁵²¹ is an apocalyptic number.

It is an amenable number.

673521 is a deficient number, since it is larger than the sum of its proper divisors (228303).

673521 is a wasteful number, since it uses less digits than its factorization.

673521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951.

The product of its digits is 1260, while the sum is 24.

The square root of 673521 is about 820.6832519310. The cubic root of 673521 is about 87.6564168181.

Adding to 673521 its reverse (125376), we get a palindrome (798897).

The spelling of 673521 in words is "six hundred seventy-three thousand, five hundred twenty-one".