638041547 has 16 divisors (see below), whose sum is σ = 750317568. Its totient is φ = 534898080.

The previous prime is 638041529. The next prime is 638041559. The reversal of 638041547 is 745140836.

It is a cyclic number.

It is not a de Polignac number, because 638041547 - 2⁸ = 638041291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638041547.

It is not an unprimeable number, because it can be changed into a prime (638047547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236468 + ... + 239150.

It is an arithmetic number, because the mean of its divisors is an integer number (46894848).

Almost surely, 2^638041547 is an apocalyptic number.

638041547 is a deficient number, since it is larger than the sum of its proper divisors (112276021).

638041547 is a wasteful number, since it uses less digits than its factorization.

638041547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 638041547 is about 25259.4842979820. The cubic root of 638041547 is about 860.8939447052.

The spelling of 638041547 in words is "six hundred thirty-eight million, forty-one thousand, five hundred forty-seven".