638803 has 4 divisors (see below), whose sum is σ = 696888. Its totient is φ = 580720.

The previous prime is 638801. The next prime is 638819. The reversal of 638803 is 308836.

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 638803 - 2¹ = 638801 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638801) 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, 29026 + ... + 29047.

It is an arithmetic number, because the mean of its divisors is an integer number (174222).

2⁶³⁸⁸⁰³ is an apocalyptic number.

638803 is a deficient number, since it is larger than the sum of its proper divisors (58085).

638803 is a wasteful number, since it uses less digits than its factorization.

638803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58084.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 638803 is about 799.2515248656. The cubic root of 638803 is about 86.1236278564.

It can be divided in two parts, 638 and 803, that added together give a palindrome (1441).

The spelling of 638803 in words is "six hundred thirty-eight thousand, eight hundred three".