638458 has 8 divisors (see below), whose sum is σ = 971028. Its totient is φ = 314784.

The previous prime is 638453. The next prime is 638459. The reversal of 638458 is 854836.

It can be written as a sum of positive squares in 2 ways, for example, as 635209 + 3249 = 797^2 + 57^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (638453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041 + ... + 2332.

2⁶³⁸⁴⁵⁸ is an apocalyptic number.

638458 is a deficient number, since it is larger than the sum of its proper divisors (332570).

638458 is a wasteful number, since it uses less digits than its factorization.

638458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4448.

The product of its digits is 23040, while the sum is 34.

The square root of 638458 is about 799.0356687908. The cubic root of 638458 is about 86.1081207271.

The spelling of 638458 in words is "six hundred thirty-eight thousand, four hundred fifty-eight".