639282321 has 8 divisors (see below), whose sum is σ = 947084960. Its totient is φ = 426188196.

The previous prime is 639282289. The next prime is 639282353. The reversal of 639282321 is 123282936.

It is an interprime number because it is at equal distance from previous prime (639282289) and next prime (639282353).

It is not a de Polignac number, because 639282321 - 2⁵ = 639282289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639282121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11838535 + ... + 11838588.

It is an arithmetic number, because the mean of its divisors is an integer number (118385620).

Almost surely, 2^639282321 is an apocalyptic number.

It is an amenable number.

639282321 is a deficient number, since it is larger than the sum of its proper divisors (307802639).

639282321 is a wasteful number, since it uses less digits than its factorization.

639282321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23677132 (or 23677126 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 639282321 is about 25284.0329259396. The cubic root of 639282321 is about 861.4516320862.

The spelling of 639282321 in words is "six hundred thirty-nine million, two hundred eighty-two thousand, three hundred twenty-one".