638339 has 4 divisors (see below), whose sum is σ = 687456. Its totient is φ = 589224.

The previous prime is 638327. The next prime is 638347. The reversal of 638339 is 933836.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638359) 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, 24539 + ... + 24564.

It is an arithmetic number, because the mean of its divisors is an integer number (171864).

2⁶³⁸³³⁹ is an apocalyptic number.

638339 is a deficient number, since it is larger than the sum of its proper divisors (49117).

638339 is a wasteful number, since it uses less digits than its factorization.

638339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49116.

The product of its digits is 11664, while the sum is 32.

The square root of 638339 is about 798.9612005598. The cubic root of 638339 is about 86.1027705954.

The spelling of 638339 in words is "six hundred thirty-eight thousand, three hundred thirty-nine".