639383 has 4 divisors (see below), whose sum is σ = 650280. Its totient is φ = 628488.

The previous prime is 639371. The next prime is 639391. The reversal of 639383 is 383936.

It is a happy number.

639383 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 639383 - 2¹⁰ = 638359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639083) 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, 5360 + ... + 5477.

It is an arithmetic number, because the mean of its divisors is an integer number (162570).

2⁶³⁹³⁸³ is an apocalyptic number.

639383 is a deficient number, since it is larger than the sum of its proper divisors (10897).

639383 is a wasteful number, since it uses less digits than its factorization.

639383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896.

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

The square root of 639383 is about 799.6142820135. The cubic root of 639383 is about 86.1496852345.

The spelling of 639383 in words is "six hundred thirty-nine thousand, three hundred eighty-three".