638226 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 207792.

The previous prime is 638201. The next prime is 638233. The reversal of 638226 is 622836.

638226 is a `hidden beast` number, since 638 + 2 + 26 = 666.

638226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 638226.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2751 + ... + 2973.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶³⁸²²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725760).

638226 is an abundant number, since it is smaller than the sum of its proper divisors (813294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638226 is a wasteful number, since it uses less digits than its factorization.

638226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 281 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 638226 is about 798.8904806042. The cubic root of 638226 is about 86.0976896028.

The spelling of 638226 in words is "six hundred thirty-eight thousand, two hundred twenty-six".