638394 has 16 divisors (see below), whose sum is σ = 1290432. Its totient is φ = 210528.

The previous prime is 638371. The next prime is 638423. The reversal of 638394 is 493836.

It is an unprimeable number.

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, 102 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (80652).

2⁶³⁸³⁹⁴ is an apocalyptic number.

638394 is an abundant number, since it is smaller than the sum of its proper divisors (652038).

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

638394 is a wasteful number, since it uses less digits than its factorization.

638394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its digits is 15552, while the sum is 33.

The square root of 638394 is about 798.9956195124. The cubic root of 638394 is about 86.1052434280.

The spelling of 638394 in words is "six hundred thirty-eight thousand, three hundred ninety-four".