674021 has 4 divisors (see below), whose sum is σ = 676044. Its totient is φ = 672000.

The previous prime is 674017. The next prime is 674057. The reversal of 674021 is 120476.

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 343396 + 330625 = 586^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 674021 - 2² = 674017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 673984 and 674002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (674071) 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, 380 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (169011).

2⁶⁷⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

674021 is a deficient number, since it is larger than the sum of its proper divisors (2023).

674021 is a wasteful number, since it uses less digits than its factorization.

674021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 674021 is about 820.9878196417. The cubic root of 674021 is about 87.6781025400.

Adding to 674021 its sum of digits (20), we get a square (674041 = 821²).

Adding to 674021 its reverse (120476), we get a palindrome (794497).

The spelling of 674021 in words is "six hundred seventy-four thousand, twenty-one".