638147443 has 8 divisors (see below), whose sum is σ = 666151200. Its totient is φ = 610165248.

The previous prime is 638147437. The next prime is 638147453. The reversal of 638147443 is 344741836.

638147443 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 a de Polignac number, because none of the positive numbers 2^k-638147443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638147396 and 638147405.

It is not an unprimeable number, because it can be changed into a prime (638147453) 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, 95413 + ... + 101881.

It is an arithmetic number, because the mean of its divisors is an integer number (83268900).

Almost surely, 2^638147443 is an apocalyptic number.

638147443 is a deficient number, since it is larger than the sum of its proper divisors (28003757).

638147443 is a wasteful number, since it uses less digits than its factorization.

638147443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10781.

The product of its digits is 193536, while the sum is 40.

The square root of 638147443 is about 25261.5803741571. The cubic root of 638147443 is about 860.9415697031.

It can be divided in two parts, 6381 and 47443, that added together give a square (53824 = 232²).

The spelling of 638147443 in words is "six hundred thirty-eight million, one hundred forty-seven thousand, four hundred forty-three".