639496307 has 8 divisors (see below), whose sum is σ = 655114176. Its totient is φ = 624057192.

The previous prime is 639496289. The next prime is 639496309. The reversal of 639496307 is 703694936.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639496307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639496309) 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, 37433 + ... + 51770.

It is an arithmetic number, because the mean of its divisors is an integer number (81889272).

Almost surely, 2^639496307 is an apocalyptic number.

639496307 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

639496307 is a deficient number, since it is larger than the sum of its proper divisors (15617869).

639496307 is a wasteful number, since it uses less digits than its factorization.

639496307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89377.

The product of its (nonzero) digits is 734832, while the sum is 47.

The square root of 639496307 is about 25288.2642148488. The cubic root of 639496307 is about 861.5477388291.

The spelling of 639496307 in words is "six hundred thirty-nine million, four hundred ninety-six thousand, three hundred seven".