638475 has 12 divisors (see below), whose sum is σ = 1055736. Its totient is φ = 340480.

The previous prime is 638467. The next prime is 638489. The reversal of 638475 is 574836.

It is not a de Polignac number, because 638475 - 2³ = 638467 is a prime.

638475 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638475.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4182 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (87978).

2⁶³⁸⁴⁷⁵ is an apocalyptic number.

638475 is a deficient number, since it is larger than the sum of its proper divisors (417261).

638475 is a wasteful number, since it uses less digits than its factorization.

638475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8526 (or 8521 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 638475 is about 799.0463065430. The cubic root of 638475 is about 86.1088849773.

The spelling of 638475 in words is "six hundred thirty-eight thousand, four hundred seventy-five".