639196707 has 8 divisors (see below), whose sum is σ = 860227776. Its totient is φ = 422148392.

The previous prime is 639196699. The next prime is 639196709. The reversal of 639196707 is 707691936.

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 639196707 - 2³ = 639196699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639196709) 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, 995313 + ... + 995954.

It is an arithmetic number, because the mean of its divisors is an integer number (107528472).

Almost surely, 2^639196707 is an apocalyptic number.

639196707 is a deficient number, since it is larger than the sum of its proper divisors (221031069).

639196707 is a wasteful number, since it uses less digits than its factorization.

639196707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991377.

The product of its (nonzero) digits is 428652, while the sum is 48.

The square root of 639196707 is about 25282.3398244704. The cubic root of 639196707 is about 861.4131745794.

The spelling of 639196707 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, seven hundred seven".