639349789 has 8 divisors (see below), whose sum is σ = 703180800. Its totient is φ = 577611696.

The previous prime is 639349693. The next prime is 639349793. The reversal of 639349789 is 987943936.

639349789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 639349789 - 2⁷ = 639349661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639349189) 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, 522589 + ... + 523810.

It is an arithmetic number, because the mean of its divisors is an integer number (87897600).

Almost surely, 2^639349789 is an apocalyptic number.

It is an amenable number.

639349789 is a deficient number, since it is larger than the sum of its proper divisors (63831011).

639349789 is a wasteful number, since it uses less digits than its factorization.

639349789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046459.

The product of its digits is 8817984, while the sum is 58.

The square root of 639349789 is about 25285.3670924509. The cubic root of 639349789 is about 861.4819360549.

The spelling of 639349789 in words is "six hundred thirty-nine million, three hundred forty-nine thousand, seven hundred eighty-nine".