639382889 has 8 divisors (see below), whose sum is σ = 673895040. Its totient is φ = 604956816.

The previous prime is 639382883. The next prime is 639382921. The reversal of 639382889 is 988283936.

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 639382889 - 2⁴ = 639382873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639382883) 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, 5969 + ... + 36254.

It is an arithmetic number, because the mean of its divisors is an integer number (84236880).

Almost surely, 2^639382889 is an apocalyptic number.

It is an amenable number.

639382889 is a deficient number, since it is larger than the sum of its proper divisors (34512151).

639382889 is a wasteful number, since it uses less digits than its factorization.

639382889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43039.

The product of its digits is 4478976, while the sum is 56.

The square root of 639382889 is about 25286.0216127409. The cubic root of 639382889 is about 861.4968024918.

The spelling of 639382889 in words is "six hundred thirty-nine million, three hundred eighty-two thousand, eight hundred eighty-nine".