638306 has 8 divisors (see below), whose sum is σ = 960960. Its totient is φ = 317988.

The previous prime is 638303. The next prime is 638317. The reversal of 638306 is 603836.

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

It is not an unprimeable number, because it can be changed into a prime (638303) 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, 515 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (120120).

2⁶³⁸³⁰⁶ is an apocalyptic number.

638306 is a deficient number, since it is larger than the sum of its proper divisors (322654).

638306 is a wasteful number, since it uses less digits than its factorization.

638306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 638306 is about 798.9405484765. The cubic root of 638306 is about 86.1012868277.

It can be divided in two parts, 63830 and 6, that added together give a palindrome (63836).

The spelling of 638306 in words is "six hundred thirty-eight thousand, three hundred six".