639848471 has 4 divisors (see below), whose sum is σ = 654728712. Its totient is φ = 624968232.

The previous prime is 639848467. The next prime is 639848483. The reversal of 639848471 is 174848936.

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 639848471 - 2² = 639848467 is a prime.

It is a super-3 number, since 3×639848471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639848441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7440056 + ... + 7440141.

It is an arithmetic number, because the mean of its divisors is an integer number (163682178).

Almost surely, 2^639848471 is an apocalyptic number.

639848471 is a deficient number, since it is larger than the sum of its proper divisors (14880241).

639848471 is a wasteful number, since it uses less digits than its factorization.

639848471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14880240.

The product of its digits is 1161216, while the sum is 50.

The square root of 639848471 is about 25295.2262492352. The cubic root of 639848471 is about 861.7058582831.

The spelling of 639848471 in words is "six hundred thirty-nine million, eight hundred forty-eight thousand, four hundred seventy-one".