639148473 has 24 divisors (see below), whose sum is σ = 989913600. Its totient is φ = 395950464.

The previous prime is 639148417. The next prime is 639148511. The reversal of 639148473 is 374841936.

639148473 is a `hidden beast` number, since 6 + 39 + 148 + 473 = 666.

It is not a de Polignac number, because 639148473 - 2⁶ = 639148409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639148073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14353 + ... + 38526.

It is an arithmetic number, because the mean of its divisors is an integer number (41246400).

Almost surely, 2^639148473 is an apocalyptic number.

It is an amenable number.

639148473 is a deficient number, since it is larger than the sum of its proper divisors (350765127).

639148473 is a wasteful number, since it uses less digits than its factorization.

639148473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52981 (or 52978 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 639148473 is about 25281.3858995111. The cubic root of 639148473 is about 861.3915065244.

The spelling of 639148473 in words is "six hundred thirty-nine million, one hundred forty-eight thousand, four hundred seventy-three".