638088193 has 4 divisors (see below), whose sum is σ = 644283328. Its totient is φ = 631893060.

The previous prime is 638088181. The next prime is 638088203. The reversal of 638088193 is 391880836.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638088193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638088133) 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, 3097413 + ... + 3097618.

It is an arithmetic number, because the mean of its divisors is an integer number (161070832).

Almost surely, 2^638088193 is an apocalyptic number.

It is an amenable number.

638088193 is a deficient number, since it is larger than the sum of its proper divisors (6195135).

638088193 is a wasteful number, since it uses less digits than its factorization.

638088193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195134.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 638088193 is about 25260.4076174554. The cubic root of 638088193 is about 860.9149236318.

The spelling of 638088193 in words is "six hundred thirty-eight million, eighty-eight thousand, one hundred ninety-three".