638207 has 4 divisors (see below), whose sum is σ = 640560. Its totient is φ = 635856.

The previous prime is 638201. The next prime is 638233. The reversal of 638207 is 702836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638207 - 2¹⁸ = 376063 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638201) 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, 707 + ... + 1332.

It is an arithmetic number, because the mean of its divisors is an integer number (160140).

2⁶³⁸²⁰⁷ is an apocalyptic number.

638207 is a deficient number, since it is larger than the sum of its proper divisors (2353).

638207 is a wasteful number, since it uses less digits than its factorization.

638207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 638207 is about 798.8785890234. The cubic root of 638207 is about 86.0968352177.

The spelling of 638207 in words is "six hundred thirty-eight thousand, two hundred seven".