639489335 has 8 divisors (see below), whose sum is σ = 785233680. Its totient is φ = 499693824.

The previous prime is 639489329. The next prime is 639489343. The reversal of 639489335 is 533984936.

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

It is a cyclic number.

It is not a de Polignac number, because 639489335 - 2¹⁸ = 639227191 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1486970 + ... + 1487399.

It is an arithmetic number, because the mean of its divisors is an integer number (98154210).

Almost surely, 2^639489335 is an apocalyptic number.

639489335 is a deficient number, since it is larger than the sum of its proper divisors (145744345).

639489335 is a wasteful number, since it uses less digits than its factorization.

639489335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2974417.

The product of its digits is 2099520, while the sum is 50.

The square root of 639489335 is about 25288.1263639677. The cubic root of 639489335 is about 861.5446078584.

The spelling of 639489335 in words is "six hundred thirty-nine million, four hundred eighty-nine thousand, three hundred thirty-five".