638934171 has 8 divisors (see below), whose sum is σ = 902024784. Its totient is φ = 400899840.

The previous prime is 638934169. The next prime is 638934173. The reversal of 638934171 is 171439836.

638934171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (638934169) and next prime (638934173).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638934171 - 2¹ = 638934169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638934173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6264010 + ... + 6264111.

It is an arithmetic number, because the mean of its divisors is an integer number (112753098).

Almost surely, 2^638934171 is an apocalyptic number.

638934171 is a deficient number, since it is larger than the sum of its proper divisors (263090613).

638934171 is a wasteful number, since it uses less digits than its factorization.

638934171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12528141.

The product of its digits is 108864, while the sum is 42.

The square root of 638934171 is about 25277.1472084965. The cubic root of 638934171 is about 861.2952229191.

The spelling of 638934171 in words is "six hundred thirty-eight million, nine hundred thirty-four thousand, one hundred seventy-one".