639341109 has 12 divisors (see below), whose sum is σ = 1007446752. Its totient is φ = 387479400.

The previous prime is 639341041. The next prime is 639341113. The reversal of 639341109 is 901143936.

639341109 is a `hidden beast` number, since 639 + 3 + 4 + 1 + 10 + 9 = 666.

It is not a de Polignac number, because 639341109 - 2¹⁹ = 638816821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639341119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3228897 + ... + 3229094.

It is an arithmetic number, because the mean of its divisors is an integer number (83953896).

Almost surely, 2^639341109 is an apocalyptic number.

It is an amenable number.

639341109 is a deficient number, since it is larger than the sum of its proper divisors (368105643).

639341109 is a wasteful number, since it uses less digits than its factorization.

639341109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458008 (or 6458005 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 639341109 is about 25285.1954510935. The cubic root of 639341109 is about 861.4780374602.

The spelling of 639341109 in words is "six hundred thirty-nine million, three hundred forty-one thousand, one hundred nine".