673721243 has 16 divisors (see below), whose sum is σ = 760099200. Its totient is φ = 592824960.

The previous prime is 673721227. The next prime is 673721273. The reversal of 673721243 is 342127376.

It is not a de Polignac number, because 673721243 - 2⁴ = 673721227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673721273) 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 15 ways as a sum of consecutive naturals, for example, 18473 + ... + 41093.

It is an arithmetic number, because the mean of its divisors is an integer number (47506200).

Almost surely, 2^673721243 is an apocalyptic number.

673721243 is a deficient number, since it is larger than the sum of its proper divisors (86377957).

673721243 is a wasteful number, since it uses less digits than its factorization.

673721243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22742.

The product of its digits is 42336, while the sum is 35.

The square root of 673721243 is about 25956.1407570540. The cubic root of 673721243 is about 876.6510293410.

The spelling of 673721243 in words is "six hundred seventy-three million, seven hundred twenty-one thousand, two hundred forty-three".