639382 has 4 divisors (see below), whose sum is σ = 959076. Its totient is φ = 319690.

The previous prime is 639371. The next prime is 639391. The reversal of 639382 is 283936.

It is a happy number.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159844 + ... + 159847.

It is an arithmetic number, because the mean of its divisors is an integer number (239769).

2⁶³⁹³⁸² is an apocalyptic number.

639382 is a deficient number, since it is larger than the sum of its proper divisors (319694).

639382 is a wasteful number, since it uses less digits than its factorization.

639382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319693.

The product of its digits is 7776, while the sum is 31.

The square root of 639382 is about 799.6136567118. The cubic root of 639382 is about 86.1496403216.

The spelling of 639382 in words is "six hundred thirty-nine thousand, three hundred eighty-two".