1538871687 has 6 divisors (see below), whose sum is σ = 2222814672. Its totient is φ = 1025914452.

The previous prime is 1538871683. The next prime is 1538871703. The reversal of 1538871687 is 7861788351.

It is a happy number.

It is not a de Polignac number, because 1538871687 - 2² = 1538871683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538871683) 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 5 ways as a sum of consecutive naturals, for example, 85492863 + ... + 85492880.

It is an arithmetic number, because the mean of its divisors is an integer number (370469112).

Almost surely, 2^1538871687 is an apocalyptic number.

1538871687 is a deficient number, since it is larger than the sum of its proper divisors (683942985).

1538871687 is a wasteful number, since it uses less digits than its factorization.

1538871687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170985749 (or 170985746 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 1538871687 is about 39228.4550677184. The cubic root of 1538871687 is about 1154.5182518944.

The spelling of 1538871687 in words is "one billion, five hundred thirty-eight million, eight hundred seventy-one thousand, six hundred eighty-seven".