638387303 has 4 divisors (see below), whose sum is σ = 640760760. Its totient is φ = 636013848.

The previous prime is 638387273. The next prime is 638387317. The reversal of 638387303 is 303783836.

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 638387303 - 2¹⁴ = 638370919 is a prime.

It is a super-2 number, since 2×638387303² = 815076697263227618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638387203) 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, 1186325 + ... + 1186862.

It is an arithmetic number, because the mean of its divisors is an integer number (160190190).

Almost surely, 2^638387303 is an apocalyptic number.

638387303 is a deficient number, since it is larger than the sum of its proper divisors (2373457).

638387303 is a wasteful number, since it uses less digits than its factorization.

638387303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373456.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 638387303 is about 25266.3274537476. The cubic root of 638387303 is about 861.0494233449.

The spelling of 638387303 in words is "six hundred thirty-eight million, three hundred eighty-seven thousand, three hundred three".