638287 has 8 divisors (see below), whose sum is σ = 706496. Its totient is φ = 572832.

The previous prime is 638269. The next prime is 638303. The reversal of 638287 is 782836.

It is a happy number.

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

It is not a de Polignac number, because 638287 - 2⁷ = 638159 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638587) 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 7 ways as a sum of consecutive naturals, for example, 183 + ... + 1144.

It is an arithmetic number, because the mean of its divisors is an integer number (88312).

2⁶³⁸²⁸⁷ is an apocalyptic number.

638287 is a deficient number, since it is larger than the sum of its proper divisors (68209).

638287 is a wasteful number, since it uses less digits than its factorization.

638287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377.

The product of its digits is 16128, while the sum is 34.

The square root of 638287 is about 798.9286576410. The cubic root of 638287 is about 86.1004325140.

The spelling of 638287 in words is "six hundred thirty-eight thousand, two hundred eighty-seven".