638647343 has 8 divisors (see below), whose sum is σ = 665148960. Its totient is φ = 612632160.

The previous prime is 638647333. The next prime is 638647393. The reversal of 638647343 is 343746836.

638647343 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638647343 - 2¹⁶ = 638581807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638647294 and 638647303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638647333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118928 + ... + 124181.

It is an arithmetic number, because the mean of its divisors is an integer number (83143620).

Almost surely, 2^638647343 is an apocalyptic number.

638647343 is a deficient number, since it is larger than the sum of its proper divisors (26501617).

638647343 is a wasteful number, since it uses less digits than its factorization.

638647343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243217.

The product of its digits is 870912, while the sum is 44.

The square root of 638647343 is about 25271.4729091915. The cubic root of 638647343 is about 861.1663204573.

The spelling of 638647343 in words is "six hundred thirty-eight million, six hundred forty-seven thousand, three hundred forty-three".