638236 has 12 divisors (see below), whose sum is σ = 1122520. Its totient is φ = 317520.

The previous prime is 638233. The next prime is 638263. The reversal of 638236 is 632836.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638233) by changing a digit.

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, 1306 + ... + 1726.

2⁶³⁸²³⁶ is an apocalyptic number.

It is an amenable number.

638236 is a deficient number, since it is larger than the sum of its proper divisors (484284).

638236 is a wasteful number, since it uses less digits than its factorization.

638236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 802 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 638236 is about 798.8967392598. The cubic root of 638236 is about 86.0981392724.

The spelling of 638236 in words is "six hundred thirty-eight thousand, two hundred thirty-six".