639848473 has 8 divisors (see below), whose sum is σ = 699779520. Its totient is φ = 580211280.

The previous prime is 639848467. The next prime is 639848483. The reversal of 639848473 is 374848936.

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

It is not a de Polignac number, because 639848473 - 2⁵ = 639848441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639848473.

It is not an unprimeable number, because it can be changed into a prime (639848483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68893 + ... + 77626.

It is an arithmetic number, because the mean of its divisors is an integer number (87472440).

Almost surely, 2^639848473 is an apocalyptic number.

It is an amenable number.

639848473 is a deficient number, since it is larger than the sum of its proper divisors (59931047).

639848473 is a wasteful number, since it uses less digits than its factorization.

639848473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146927.

The product of its digits is 3483648, while the sum is 52.

The square root of 639848473 is about 25295.2262887684. The cubic root of 639848473 is about 861.7058591810.

The spelling of 639848473 in words is "six hundred thirty-nine million, eight hundred forty-eight thousand, four hundred seventy-three".