638043047 has 16 divisors (see below), whose sum is σ = 684748800. Its totient is φ = 592764480.

The previous prime is 638043019. The next prime is 638043053. The reversal of 638043047 is 740340836.

638043047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 638043047 - 2⁸ = 638042791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638042998 and 638043016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638043647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213272 + ... + 216242.

It is an arithmetic number, because the mean of its divisors is an integer number (42796800).

Almost surely, 2^638043047 is an apocalyptic number.

638043047 is a deficient number, since it is larger than the sum of its proper divisors (46705753).

638043047 is a wasteful number, since it uses less digits than its factorization.

638043047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 638043047 is about 25259.5139897821. The cubic root of 638043047 is about 860.8946193425.

The spelling of 638043047 in words is "six hundred thirty-eight million, forty-three thousand, forty-seven".