2172571938 has 12 divisors (see below), whose sum is σ = 4707239238. Its totient is φ = 724190640.

The previous prime is 2172571903. The next prime is 2172571963. The reversal of 2172571938 is 8391752712.

2172571938 is a `hidden beast` number, since 2 + 1 + 72 + 571 + 9 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1165334769 + 1007237169 = 34137^2 + 31737^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2172571893 and 2172571902.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60349203 + ... + 60349238.

Almost surely, 2^2172571938 is an apocalyptic number.

2172571938 is an abundant number, since it is smaller than the sum of its proper divisors (2534667300).

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

2172571938 is a wasteful number, since it uses less digits than its factorization.

2172571938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120698449 (or 120698446 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 2172571938 is about 46610.8564392460. The cubic root of 2172571938 is about 1295.1638732609.

The spelling of 2172571938 in words is "two billion, one hundred seventy-two million, five hundred seventy-one thousand, nine hundred thirty-eight".