639424982 has 8 divisors (see below), whose sum is σ = 1096157136. Its totient is φ = 274039272.

The previous prime is 639424969. The next prime is 639424987. The reversal of 639424982 is 289424936.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639424987) 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, 22836593 + ... + 22836620.

It is an arithmetic number, because the mean of its divisors is an integer number (137019642).

Almost surely, 2^639424982 is an apocalyptic number.

639424982 is a deficient number, since it is larger than the sum of its proper divisors (456732154).

639424982 is a wasteful number, since it uses less digits than its factorization.

639424982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45673222.

The product of its digits is 746496, while the sum is 47.

The square root of 639424982 is about 25286.8539363836. The cubic root of 639424982 is about 861.5157072774.

The spelling of 639424982 in words is "six hundred thirty-nine million, four hundred twenty-four thousand, nine hundred eighty-two".