638103 has 4 divisors (see below), whose sum is σ = 850808. Its totient is φ = 425400.

The previous prime is 638081. The next prime is 638117. The reversal of 638103 is 301836.

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

It is not a de Polignac number, because 638103 - 2¹⁰ = 637079 is a prime.

It is a D-number.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638123) 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, 106348 + ... + 106353.

It is an arithmetic number, because the mean of its divisors is an integer number (212702).

2⁶³⁸¹⁰³ is an apocalyptic number.

638103 is a deficient number, since it is larger than the sum of its proper divisors (212705).

638103 is a wasteful number, since it uses less digits than its factorization.

638103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212704.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 638103 is about 798.8134951289. The cubic root of 638103 is about 86.0921582831.

Adding to 638103 its reverse (301836), we get a palindrome (939939).

It can be divided in two parts, 638 and 103, that added together give a triangular number (741 = T₃₈).

The spelling of 638103 in words is "six hundred thirty-eight thousand, one hundred three".