639103 has 4 divisors (see below), whose sum is σ = 672760. Its totient is φ = 605448.

The previous prime is 639091. The next prime is 639137. The reversal of 639103 is 301936.

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 639103 - 2¹³ = 630911 is a prime.

It is a Duffinian number.

639103 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639143) 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, 16800 + ... + 16837.

It is an arithmetic number, because the mean of its divisors is an integer number (168190).

2⁶³⁹¹⁰³ is an apocalyptic number.

639103 is a deficient number, since it is larger than the sum of its proper divisors (33657).

639103 is a wasteful number, since it uses less digits than its factorization.

639103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33656.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 639103 is about 799.4391784245. The cubic root of 639103 is about 86.1371077789.

The spelling of 639103 in words is "six hundred thirty-nine thousand, one hundred three".