638198 has 8 divisors (see below), whose sum is σ = 1044360. Its totient is φ = 290080.

The previous prime is 638179. The next prime is 638201. The reversal of 638198 is 891836.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

638198 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14483 + ... + 14526.

It is an arithmetic number, because the mean of its divisors is an integer number (130545).

2⁶³⁸¹⁹⁸ is an apocalyptic number.

638198 is a deficient number, since it is larger than the sum of its proper divisors (406162).

638198 is a wasteful number, since it uses less digits than its factorization.

638198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29022.

The product of its digits is 10368, while the sum is 35.

The square root of 638198 is about 798.8729561075. The cubic root of 638198 is about 86.0964305031.

The spelling of 638198 in words is "six hundred thirty-eight thousand, one hundred ninety-eight".