639575899 has 4 divisors (see below), whose sum is σ = 639918160. Its totient is φ = 639233640.

The previous prime is 639575897. The next prime is 639575939. The reversal of 639575899 is 998575936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 639575899 - 2¹ = 639575897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639575897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168312 + ... + 172069.

It is an arithmetic number, because the mean of its divisors is an integer number (159979540).

Almost surely, 2^639575899 is an apocalyptic number.

639575899 is a deficient number, since it is larger than the sum of its proper divisors (342261).

639575899 is a wasteful number, since it uses less digits than its factorization.

639575899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342260.

The product of its digits is 18370800, while the sum is 61.

The square root of 639575899 is about 25289.8378602948. The cubic root of 639575899 is about 861.5834802203.

The spelling of 639575899 in words is "six hundred thirty-nine million, five hundred seventy-five thousand, eight hundred ninety-nine".