9139987638 has 24 divisors (see below), whose sum is σ = 19954481976. Its totient is φ = 3023404800.

The previous prime is 9139987613. The next prime is 9139987667. The reversal of 9139987638 is 8367899319.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1935723 + ... + 1940438.

It is an arithmetic number, because the mean of its divisors is an integer number (831436749).

Almost surely, 2^9139987638 is an apocalyptic number.

9139987638 is an abundant number, since it is smaller than the sum of its proper divisors (10814494338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9139987638 is a wasteful number, since it uses less digits than its factorization.

9139987638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876300 (or 3876297 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 9139987638 is about 95603.2825691670. The cubic root of 9139987638 is about 2090.8130531692.

The spelling of 9139987638 in words is "nine billion, one hundred thirty-nine million, nine hundred eighty-seven thousand, six hundred thirty-eight".