639308129 has 8 divisors (see below), whose sum is σ = 650832000. Its totient is φ = 627807312.

The previous prime is 639308123. The next prime is 639308141. The reversal of 639308129 is 921803936.

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 639308129 - 2⁴ = 639308113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639308123) 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, 56087 + ... + 66515.

It is an arithmetic number, because the mean of its divisors is an integer number (81354000).

Almost surely, 2^639308129 is an apocalyptic number.

It is an amenable number.

639308129 is a deficient number, since it is larger than the sum of its proper divisors (11523871).

639308129 is a wasteful number, since it uses less digits than its factorization.

639308129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11527.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 639308129 is about 25284.5432824087. The cubic root of 639308129 is about 861.4632242753.

The spelling of 639308129 in words is "six hundred thirty-nine million, three hundred eight thousand, one hundred twenty-nine".