638003 has 4 divisors (see below), whose sum is σ = 641088. Its totient is φ = 634920.

The previous prime is 637939. The next prime is 638023. The reversal of 638003 is 300836.

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 638003 - 2⁶ = 637939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1208 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (160272).

2⁶³⁸⁰⁰³ is an apocalyptic number.

638003 is a deficient number, since it is larger than the sum of its proper divisors (3085).

638003 is a wasteful number, since it uses less digits than its factorization.

638003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 638003 is about 798.7508998430. The cubic root of 638003 is about 86.0876607513.

Adding to 638003 its reverse (300836), we get a palindrome (938839).

The spelling of 638003 in words is "six hundred thirty-eight thousand, three".