673843639 has 6 divisors (see below), whose sum is σ = 783858984. Its totient is φ = 577580220.

The previous prime is 673843631. The next prime is 673843649. The reversal of 673843639 is 936348376.

It is not a de Polignac number, because 673843639 - 2³ = 673843631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 13751911 = 673843639 / (6 + 7 + 3 + 8 + 4 + 3 + 6 + 3 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 673843592 and 673843601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673843631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6875907 + ... + 6876004.

It is an arithmetic number, because the mean of its divisors is an integer number (130643164).

Almost surely, 2^673843639 is an apocalyptic number.

673843639 is a deficient number, since it is larger than the sum of its proper divisors (110015345).

673843639 is a wasteful number, since it uses less digits than its factorization.

673843639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13751925 (or 13751918 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 49.

The square root of 673843639 is about 25958.4983964789. The cubic root of 673843639 is about 876.7041136512.

The spelling of 673843639 in words is "six hundred seventy-three million, eight hundred forty-three thousand, six hundred thirty-nine".