638173 has 4 divisors (see below), whose sum is σ = 650268. Its totient is φ = 626080.

The previous prime is 638171. The next prime is 638177. The reversal of 638173 is 371836.

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

It can be written as a sum of positive squares in 2 ways, for example, as 432964 + 205209 = 658^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 638173 - 2¹ = 638171 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 (638171) by changing a digit.

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, 5968 + ... + 6073.

It is an arithmetic number, because the mean of its divisors is an integer number (162567).

2⁶³⁸¹⁷³ is an apocalyptic number.

It is an amenable number.

638173 is a deficient number, since it is larger than the sum of its proper divisors (12095).

638173 is a wasteful number, since it uses less digits than its factorization.

638173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12094.

The product of its digits is 3024, while the sum is 28.

The square root of 638173 is about 798.8573089107. The cubic root of 638173 is about 86.0953062758.

The spelling of 638173 in words is "six hundred thirty-eight thousand, one hundred seventy-three".