675421 has 4 divisors (see below), whose sum is σ = 683100. Its totient is φ = 667744.

The previous prime is 675419. The next prime is 675449. The reversal of 675421 is 124576.

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 52900 + 622521 = 230^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 675421 - 2¹ = 675419 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 (675481) 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, 3706 + ... + 3883.

It is an arithmetic number, because the mean of its divisors is an integer number (170775).

2⁶⁷⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

675421 is a deficient number, since it is larger than the sum of its proper divisors (7679).

675421 is an equidigital number, since it uses as much as digits as its factorization.

675421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7678.

The product of its digits is 1680, while the sum is 25.

The square root of 675421 is about 821.8400087608. The cubic root of 675421 is about 87.7387655631.

Adding to 675421 its reverse (124576), we get a palindrome (799997).

The spelling of 675421 in words is "six hundred seventy-five thousand, four hundred twenty-one".