639338 has 8 divisors (see below), whose sum is σ = 1096032. Its totient is φ = 273996.

The previous prime is 639337. The next prime is 639361. The reversal of 639338 is 833936.

It is a happy number.

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 (639337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22820 + ... + 22847.

It is an arithmetic number, because the mean of its divisors is an integer number (137004).

2⁶³⁹³³⁸ is an apocalyptic number.

639338 is a deficient number, since it is larger than the sum of its proper divisors (456694).

639338 is a wasteful number, since it uses less digits than its factorization.

639338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45676.

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

The square root of 639338 is about 799.5861429515. The cubic root of 639338 is about 86.1476641054.

The spelling of 639338 in words is "six hundred thirty-nine thousand, three hundred thirty-eight".