638384 has 20 divisors (see below), whose sum is σ = 1310184. Its totient is φ = 300288.

The previous prime is 638371. The next prime is 638423. The reversal of 638384 is 483836.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 638384.

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 3 ways as a sum of consecutive naturals, for example, 902 + ... + 1445.

2⁶³⁸³⁸⁴ is an apocalyptic number.

It is an amenable number.

638384 is an abundant number, since it is smaller than the sum of its proper divisors (671800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638384 is a wasteful number, since it uses less digits than its factorization.

638384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372 (or 2366 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 638384 is about 798.9893616313. The cubic root of 638384 is about 86.1047938326.

The spelling of 638384 in words is "six hundred thirty-eight thousand, three hundred eighty-four".