638247 has 8 divisors (see below), whose sum is σ = 871920. Its totient is φ = 415040.

The previous prime is 638233. The next prime is 638263. The reversal of 638247 is 742836.

638247 is nontrivially palindromic in base 15.

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

It is a cyclic number.

It is not a de Polignac number, because 638247 - 2¹⁶ = 572711 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638247.

It is not an unprimeable number, because it can be changed into a prime (638047) 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, 2472 + ... + 2717.

It is an arithmetic number, because the mean of its divisors is an integer number (108990).

2⁶³⁸²⁴⁷ is an apocalyptic number.

638247 is a deficient number, since it is larger than the sum of its proper divisors (233673).

638247 is a wasteful number, since it uses less digits than its factorization.

638247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5233.

The product of its digits is 8064, while the sum is 30.

The square root of 638247 is about 798.9036237244. The cubic root of 638247 is about 86.0986339034.

The spelling of 638247 in words is "six hundred thirty-eight thousand, two hundred forty-seven".