638189395 has 16 divisors (see below), whose sum is σ = 818620992. Its totient is φ = 476439040.

The previous prime is 638189327. The next prime is 638189411. The reversal of 638189395 is 593981836.

It is not a de Polignac number, because 638189395 - 2⁷ = 638189267 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62962 + ... + 72391.

It is an arithmetic number, because the mean of its divisors is an integer number (51163812).

Almost surely, 2^638189395 is an apocalyptic number.

638189395 is a deficient number, since it is larger than the sum of its proper divisors (180431597).

638189395 is a wasteful number, since it uses less digits than its factorization.

638189395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135422.

The product of its digits is 1399680, while the sum is 52.

The square root of 638189395 is about 25262.4107123608. The cubic root of 638189395 is about 860.9604354734.

The spelling of 638189395 in words is "six hundred thirty-eight million, one hundred eighty-nine thousand, three hundred ninety-five".