638227 has 4 divisors (see below), whose sum is σ = 666000. Its totient is φ = 610456.

The previous prime is 638201. The next prime is 638233. The reversal of 638227 is 722836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638195 and 638204.

It is not an unprimeable number, because it can be changed into a prime (638327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13852 + ... + 13897.

It is an arithmetic number, because the mean of its divisors is an integer number (166500).

2⁶³⁸²²⁷ is an apocalyptic number.

638227 is a deficient number, since it is larger than the sum of its proper divisors (27773).

638227 is a wasteful number, since it uses less digits than its factorization.

638227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27772.

The product of its digits is 4032, while the sum is 28.

The square root of 638227 is about 798.8911064720. The cubic root of 638227 is about 86.0977345700.

The spelling of 638227 in words is "six hundred thirty-eight thousand, two hundred twenty-seven".