639085403 has 8 divisors (see below), whose sum is σ = 738195120. Its totient is φ = 546810880.

The previous prime is 639085361. The next prime is 639085411. The reversal of 639085403 is 304580936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639085403 - 2⁸ = 639085147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639085493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1708598 + ... + 1708971.

It is an arithmetic number, because the mean of its divisors is an integer number (92274390).

Almost surely, 2^639085403 is an apocalyptic number.

639085403 is a deficient number, since it is larger than the sum of its proper divisors (99109717).

639085403 is a wasteful number, since it uses less digits than its factorization.

639085403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417597.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 639085403 is about 25280.1385083231. The cubic root of 639085403 is about 861.3631720807.

The spelling of 639085403 in words is "six hundred thirty-nine million, eighty-five thousand, four hundred three".