17938971 has 6 divisors (see below), whose sum is σ = 25911860. Its totient is φ = 11959308.

The previous prime is 17938939. The next prime is 17938979. The reversal of 17938971 is 17983971.

It is not a de Polignac number, because 17938971 - 2⁵ = 17938939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17938979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 996601 + ... + 996618.

Almost surely, 2^17938971 is an apocalyptic number.

17938971 is a deficient number, since it is larger than the sum of its proper divisors (7972889).

17938971 is a wasteful number, since it uses less digits than its factorization.

17938971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993225 (or 1993222 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 17938971 is about 4235.4422437332. The cubic root of 17938971 is about 261.7776165912. Note that the first 3 decimals are identical.

The spelling of 17938971 in words is "seventeen million, nine hundred thirty-eight thousand, nine hundred seventy-one".