638206 has 16 divisors (see below), whose sum is σ = 1009008. Its totient is φ = 302400.

The previous prime is 638201. The next prime is 638233. The reversal of 638206 is 602836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638201) by changing a digit.

638206 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3436 + ... + 3616.

It is an arithmetic number, because the mean of its divisors is an integer number (63063).

2⁶³⁸²⁰⁶ is an apocalyptic number.

638206 is a deficient number, since it is larger than the sum of its proper divisors (370802).

638206 is a wasteful number, since it uses less digits than its factorization.

638206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 638206 is about 798.8779631458. The cubic root of 638206 is about 86.0967902496.

The spelling of 638206 in words is "six hundred thirty-eight thousand, two hundred six".