3938823181 has 4 divisors (see below), whose sum is σ = 4074644700. Its totient is φ = 3803001664.

The previous prime is 3938823173. The next prime is 3938823191. The reversal of 3938823181 is 1813288393.

3938823181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2974720681 + 964102500 = 54541^2 + 31050^2 .

It is a cyclic number.

It is not a de Polignac number, because 3938823181 - 2³ = 3938823173 is a prime.

It is a super-2 number, since 2×3938823181² = 31028656102365917522, 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 (3938823151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67910716 + ... + 67910773.

It is an arithmetic number, because the mean of its divisors is an integer number (1018661175).

Almost surely, 2^3938823181 is an apocalyptic number.

It is an amenable number.

3938823181 is a deficient number, since it is larger than the sum of its proper divisors (135821519).

3938823181 is a wasteful number, since it uses less digits than its factorization.

3938823181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135821518.

The product of its digits is 248832, while the sum is 46.

The square root of 3938823181 is about 62760.0444630180. The cubic root of 3938823181 is about 1579.2667618690.

The spelling of 3938823181 in words is "three billion, nine hundred thirty-eight million, eight hundred twenty-three thousand, one hundred eighty-one".