638377227 has 16 divisors (see below), whose sum is σ = 961776000. Its totient is φ = 418370472.

The previous prime is 638377193. The next prime is 638377231. The reversal of 638377227 is 722773836.

638377227 is a `hidden beast` number, since 638 + 3 + 7 + 7 + 2 + 2 + 7 = 666.

It is not a de Polignac number, because 638377227 - 2¹⁰ = 638376203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638377237) 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, 198777 + ... + 201962.

It is an arithmetic number, because the mean of its divisors is an integer number (60111000).

Almost surely, 2^638377227 is an apocalyptic number.

638377227 is a deficient number, since it is larger than the sum of its proper divisors (323398773).

638377227 is a wasteful number, since it uses less digits than its factorization.

638377227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400807 (or 400801 counting only the distinct ones).

The product of its digits is 592704, while the sum is 45.

The square root of 638377227 is about 25266.1280571440. The cubic root of 638377227 is about 861.0448931903.

The spelling of 638377227 in words is "six hundred thirty-eight million, three hundred seventy-seven thousand, two hundred twenty-seven".