639235487 has 16 divisors (see below), whose sum is σ = 759369600. Its totient is φ = 531548640.

The previous prime is 639235477. The next prime is 639235489. The reversal of 639235487 is 784532936.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 639235487 - 2¹⁴ = 639219103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639235489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46673 + ... + 58794.

It is an arithmetic number, because the mean of its divisors is an integer number (47460600).

Almost surely, 2^639235487 is an apocalyptic number.

639235487 is a deficient number, since it is larger than the sum of its proper divisors (120134113).

639235487 is a wasteful number, since it uses less digits than its factorization.

639235487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105526.

The product of its digits is 1088640, while the sum is 47.

The square root of 639235487 is about 25283.1067513468. The cubic root of 639235487 is about 861.4305948441.

The spelling of 639235487 in words is "six hundred thirty-nine million, two hundred thirty-five thousand, four hundred eighty-seven".