638055143 has 12 divisors (see below), whose sum is σ = 704426520. Its totient is φ = 577492080.

The previous prime is 638055139. The next prime is 638055241. The reversal of 638055143 is 341550836.

It is not a de Polignac number, because 638055143 - 2² = 638055139 is a prime.

It is a super-2 number, since 2×638055143² = 814228731017500898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638055043) 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 11 ways as a sum of consecutive naturals, for example, 16196 + ... + 39222.

It is an arithmetic number, because the mean of its divisors is an integer number (58702210).

Almost surely, 2^638055143 is an apocalyptic number.

638055143 is a deficient number, since it is larger than the sum of its proper divisors (66371377).

638055143 is a wasteful number, since it uses less digits than its factorization.

638055143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23278 (or 23267 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 638055143 is about 25259.7534231829. The cubic root of 638055143 is about 860.9000595791.

The spelling of 638055143 in words is "six hundred thirty-eight million, fifty-five thousand, one hundred forty-three".