639514539 has 12 divisors (see below), whose sum is σ = 924807936. Its totient is φ = 425851632.

The previous prime is 639514523. The next prime is 639514541. The reversal of 639514539 is 935415936.

639514539 is a `hidden beast` number, since 63 + 9 + 51 + 4 + 539 = 666.

It is not a de Polignac number, because 639514539 - 2⁴ = 639514523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639514494 and 639514503.

It is not an unprimeable number, because it can be changed into a prime (639514339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32619 + ... + 48404.

It is an arithmetic number, because the mean of its divisors is an integer number (77067328).

Almost surely, 2^639514539 is an apocalyptic number.

639514539 is a deficient number, since it is larger than the sum of its proper divisors (285293397).

639514539 is a wasteful number, since it uses less digits than its factorization.

639514539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81906 (or 81903 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The square root of 639514539 is about 25288.6246957006. The cubic root of 639514539 is about 861.5559263088. Note that the first 3 decimals are identical.

The spelling of 639514539 in words is "six hundred thirty-nine million, five hundred fourteen thousand, five hundred thirty-nine".