638038353 has 4 divisors (see below), whose sum is σ = 850717808. Its totient is φ = 425358900.

The previous prime is 638038337. The next prime is 638038361. The reversal of 638038353 is 353830836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 638038353 - 2⁴ = 638038337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638038553) 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, 106339723 + ... + 106339728.

It is an arithmetic number, because the mean of its divisors is an integer number (212679452).

Almost surely, 2^638038353 is an apocalyptic number.

It is an amenable number.

638038353 is a deficient number, since it is larger than the sum of its proper divisors (212679455).

638038353 is a wasteful number, since it uses less digits than its factorization.

638038353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212679454.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 638038353 is about 25259.4210741260. The cubic root of 638038353 is about 860.8925081739.

The spelling of 638038353 in words is "six hundred thirty-eight million, thirty-eight thousand, three hundred fifty-three".