638107 has 4 divisors (see below), whose sum is σ = 642096. Its totient is φ = 634120.

The previous prime is 638081. The next prime is 638117. The reversal of 638107 is 701836.

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 638107 - 2¹¹ = 636059 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638117) 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, 1744 + ... + 2077.

It is an arithmetic number, because the mean of its divisors is an integer number (160524).

2⁶³⁸¹⁰⁷ is an apocalyptic number.

638107 is a deficient number, since it is larger than the sum of its proper divisors (3989).

638107 is a wasteful number, since it uses less digits than its factorization.

638107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 638107 is about 798.8159988383. The cubic root of 638107 is about 86.0923381746.

The spelling of 638107 in words is "six hundred thirty-eight thousand, one hundred seven".