639941485 has 8 divisors (see below), whose sum is σ = 768119040. Its totient is φ = 511827024.

The previous prime is 639941483. The next prime is 639941501. The reversal of 639941485 is 584149936.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 639941485 - 2¹ = 639941483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639941483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10536 + ... + 37294.

It is an arithmetic number, because the mean of its divisors is an integer number (96014880).

Almost surely, 2^639941485 is an apocalyptic number.

It is an amenable number.

639941485 is a deficient number, since it is larger than the sum of its proper divisors (128177555).

639941485 is a wasteful number, since it uses less digits than its factorization.

639941485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31547.

The product of its digits is 933120, while the sum is 49.

The square root of 639941485 is about 25297.0647506781. The cubic root of 639941485 is about 861.7476113069.

The spelling of 639941485 in words is "six hundred thirty-nine million, nine hundred forty-one thousand, four hundred eighty-five".