639317289 has 8 divisors (see below), whose sum is σ = 917994112. Its totient is φ = 393426000.

The previous prime is 639317281. The next prime is 639317297. The reversal of 639317289 is 982713936.

It is an interprime number because it is at equal distance from previous prime (639317281) and next prime (639317297).

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

It is not a de Polignac number, because 639317289 - 2³ = 639317281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639317281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8196337 + ... + 8196414.

It is an arithmetic number, because the mean of its divisors is an integer number (114749264).

Almost surely, 2^639317289 is an apocalyptic number.

It is an amenable number.

639317289 is a deficient number, since it is larger than the sum of its proper divisors (278676823).

639317289 is a wasteful number, since it uses less digits than its factorization.

639317289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16392767.

The product of its digits is 489888, while the sum is 48.

The square root of 639317289 is about 25284.7244200921. The cubic root of 639317289 is about 861.4673386009.

The spelling of 639317289 in words is "six hundred thirty-nine million, three hundred seventeen thousand, two hundred eighty-nine".