639125877 has 16 divisors (see below), whose sum is σ = 930294848. Its totient is φ = 387918720.

The previous prime is 639125843. The next prime is 639125951. The reversal of 639125877 is 778521936.

It is not a de Polignac number, because 639125877 - 2⁸ = 639125621 is a prime.

It is a super-3 number, since 3×639125877³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639125807) 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 15 ways as a sum of consecutive naturals, for example, 109399 + ... + 115092.

It is an arithmetic number, because the mean of its divisors is an integer number (58143428).

Almost surely, 2^639125877 is an apocalyptic number.

It is an amenable number.

639125877 is a deficient number, since it is larger than the sum of its proper divisors (291168971).

639125877 is a wasteful number, since it uses less digits than its factorization.

639125877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224580.

The product of its digits is 635040, while the sum is 48.

The square root of 639125877 is about 25280.9390055037. The cubic root of 639125877 is about 861.3813553975.

The spelling of 639125877 in words is "six hundred thirty-nine million, one hundred twenty-five thousand, eight hundred seventy-seven".