638358 has 16 divisors (see below), whose sum is σ = 1459200. Its totient is φ = 182376.

The previous prime is 638347. The next prime is 638359. The reversal of 638358 is 853836.

It is a super-3 number, since 3×638358³ = 780394447823336136, which contains 333 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638358.

It is not an unprimeable number, because it can be changed into a prime (638359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7558 + ... + 7641.

It is an arithmetic number, because the mean of its divisors is an integer number (91200).

2⁶³⁸³⁵⁸ is an apocalyptic number.

638358 is an abundant number, since it is smaller than the sum of its proper divisors (820842).

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

638358 is a wasteful number, since it uses less digits than its factorization.

638358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15211.

The product of its digits is 17280, while the sum is 33.

The square root of 638358 is about 798.9730909111. The cubic root of 638358 is about 86.1036248627.

It can be divided in two parts, 6383 and 58, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 638358 in words is "six hundred thirty-eight thousand, three hundred fifty-eight".