639441097 has 8 divisors (see below), whose sum is σ = 663229440. Its totient is φ = 615768720.

The previous prime is 639441053. The next prime is 639441109. The reversal of 639441097 is 790144936.

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 639441097 - 2¹¹ = 639439049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639441007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17679 + ... + 39892.

It is an arithmetic number, because the mean of its divisors is an integer number (82903680).

Almost surely, 2^639441097 is an apocalyptic number.

It is an amenable number.

639441097 is a deficient number, since it is larger than the sum of its proper divisors (23788343).

639441097 is a wasteful number, since it uses less digits than its factorization.

639441097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57983.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 639441097 is about 25287.1725782065. The cubic root of 639441097 is about 861.5229446179.

The spelling of 639441097 in words is "six hundred thirty-nine million, four hundred forty-one thousand, ninety-seven".