1938197871 has 12 divisors (see below), whose sum is σ = 2801330272. Its totient is φ = 1291342176.

The previous prime is 1938197869. The next prime is 1938197887. The reversal of 1938197871 is 1787918391.

It is not a de Polignac number, because 1938197871 - 2¹ = 1938197869 is a prime.

It is a super-2 number, since 2×1938197871² = 7513221974297865282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938197801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50071 + ... + 79896.

Almost surely, 2^1938197871 is an apocalyptic number.

1938197871 is a deficient number, since it is larger than the sum of its proper divisors (863132401).

1938197871 is a wasteful number, since it uses less digits than its factorization.

1938197871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131630 (or 131627 counting only the distinct ones).

The product of its digits is 762048, while the sum is 54.

The square root of 1938197871 is about 44024.9687223058. The cubic root of 1938197871 is about 1246.8073985925.

It can be divided in two parts, 1938 and 197871, that added together give a square (199809 = 447²).

The spelling of 1938197871 in words is "one billion, nine hundred thirty-eight million, one hundred ninety-seven thousand, eight hundred seventy-one".