38639986917 has 16 divisors (see below), whose sum is σ = 58889313792. Its totient is φ = 22076492400.

The previous prime is 38639986909. The next prime is 38639986933. The reversal of 38639986917 is 71968993683.

It is not a de Polignac number, because 38639986917 - 2³ = 38639986909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38639986967) 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, 7143 + ... + 278084.

It is an arithmetic number, because the mean of its divisors is an integer number (3680582112).

Almost surely, 2^38639986917 is an apocalyptic number.

It is an amenable number.

38639986917 is a deficient number, since it is larger than the sum of its proper divisors (20249326875).

38639986917 is a wasteful number, since it uses less digits than its factorization.

38639986917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291688.

The product of its digits is 105815808, while the sum is 69.

The spelling of 38639986917 in words is "thirty-eight billion, six hundred thirty-nine million, nine hundred eighty-six thousand, nine hundred seventeen".