638833 has 8 divisors (see below), whose sum is σ = 694568. Its totient is φ = 584064.

The previous prime is 638819. The next prime is 638839. The reversal of 638833 is 338836.

It can be written as a sum of positive squares in 4 ways, for example, as 42849 + 595984 = 207^2 + 772^2 .

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

It is not a de Polignac number, because 638833 - 2⁵ = 638801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638795 and 638804.

It is not an unprimeable number, because it can be changed into a prime (638839) by changing a digit.

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, 1885 + ... + 2197.

It is an arithmetic number, because the mean of its divisors is an integer number (86821).

2⁶³⁸⁸³³ is an apocalyptic number.

It is an amenable number.

638833 is a deficient number, since it is larger than the sum of its proper divisors (55735).

638833 is a wasteful number, since it uses less digits than its factorization.

638833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483.

The product of its digits is 10368, while the sum is 31.

The square root of 638833 is about 799.2702922041. The cubic root of 638833 is about 86.1249760386.

The spelling of 638833 in words is "six hundred thirty-eight thousand, eight hundred thirty-three".