639788199 has 8 divisors (see below), whose sum is σ = 880568832. Its totient is φ = 412766520.

The previous prime is 639788167. The next prime is 639788213. The reversal of 639788199 is 991887936.

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

It is not a de Polignac number, because 639788199 - 2⁵ = 639788167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639788119) 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, 3439629 + ... + 3439814.

It is an arithmetic number, because the mean of its divisors is an integer number (110071104).

Almost surely, 2^639788199 is an apocalyptic number.

639788199 is a deficient number, since it is larger than the sum of its proper divisors (240780633).

639788199 is a wasteful number, since it uses less digits than its factorization.

639788199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879477.

The product of its digits is 5878656, while the sum is 60.

The square root of 639788199 is about 25294.0348501381. The cubic root of 639788199 is about 861.6788006444.

The spelling of 639788199 in words is "six hundred thirty-nine million, seven hundred eighty-eight thousand, one hundred ninety-nine".