639798693 has 8 divisors (see below), whose sum is σ = 853284000. Its totient is φ = 426422928.

The previous prime is 639798641. The next prime is 639798701. The reversal of 639798693 is 396897936.

It is a happy number.

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

It is not a de Polignac number, because 639798693 - 2¹⁷ = 639667621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639798293) 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, 12618 + ... + 37931.

It is an arithmetic number, because the mean of its divisors is an integer number (106660500).

Almost surely, 2^639798693 is an apocalyptic number.

It is an amenable number.

639798693 is a deficient number, since it is larger than the sum of its proper divisors (213485307).

639798693 is a wasteful number, since it uses less digits than its factorization.

639798693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54771.

The product of its digits is 13226976, while the sum is 60.

The square root of 639798693 is about 25294.2422895014. The cubic root of 639798693 is about 861.6835117909.

The spelling of 639798693 in words is "six hundred thirty-nine million, seven hundred ninety-eight thousand, six hundred ninety-three".