3938887481 has 2 divisors, whose sum is σ = 3938887482. Its totient is φ = 3938887480.

The previous prime is 3938887453. The next prime is 3938887483. The reversal of 3938887481 is 1847888393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2048377081 + 1890510400 = 45259^2 + 43480^2 .

It is a cyclic number.

It is not a de Polignac number, because 3938887481 - 2²² = 3934693177 is a prime.

It is a super-3 number, since 3×3938887481³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 3938887483, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3938887481.

It is not a weakly prime, because it can be changed into another prime (3938887483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969443740 + 1969443741.

It is an arithmetic number, because the mean of its divisors is an integer number (1969443741).

Almost surely, 2^3938887481 is an apocalyptic number.

It is an amenable number.

3938887481 is a deficient number, since it is larger than the sum of its proper divisors (1).

3938887481 is an equidigital number, since it uses as much as digits as its factorization.

3938887481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 59.

The square root of 3938887481 is about 62760.5567295256. The cubic root of 3938887481 is about 1579.2753554933.

The spelling of 3938887481 in words is "three billion, nine hundred thirty-eight million, eight hundred eighty-seven thousand, four hundred eighty-one".