674639 has 4 divisors (see below), whose sum is σ = 771024. Its totient is φ = 578256.

The previous prime is 674603. The next prime is 674647. The reversal of 674639 is 936476.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 674639 - 2¹² = 670543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 674599 and 674608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (674669) 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, 48182 + ... + 48195.

It is an arithmetic number, because the mean of its divisors is an integer number (192756).

2⁶⁷⁴⁶³⁹ is an apocalyptic number.

674639 is a deficient number, since it is larger than the sum of its proper divisors (96385).

674639 is an equidigital number, since it uses as much as digits as its factorization.

674639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96384.

The product of its digits is 27216, while the sum is 35.

The square root of 674639 is about 821.3641092719. The cubic root of 674639 is about 87.7048912777.

The spelling of 674639 in words is "six hundred seventy-four thousand, six hundred thirty-nine".