639253147 has 12 divisors (see below), whose sum is σ = 692955120. Its totient is φ = 589444128.

The previous prime is 639253133. The next prime is 639253169. The reversal of 639253147 is 741352936.

It is a happy number.

639253147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639253147 - 2⁷ = 639253019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639253117) 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, 240178 + ... + 242824.

It is an arithmetic number, because the mean of its divisors is an integer number (57746260).

Almost surely, 2^639253147 is an apocalyptic number.

639253147 is a deficient number, since it is larger than the sum of its proper divisors (53701973).

639253147 is a wasteful number, since it uses less digits than its factorization.

639253147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102 (or 4089 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 639253147 is about 25283.4559939894. The cubic root of 639253147 is about 861.4385276140.

The spelling of 639253147 in words is "six hundred thirty-nine million, two hundred fifty-three thousand, one hundred forty-seven".