38838781 has 2 divisors, whose sum is σ = 38838782. Its totient is φ = 38838780.

The previous prime is 38838739. The next prime is 38838797. The reversal of 38838781 is 18783883.

38838781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 17355556 = 4635^2 + 4166^2 .

It is an emirp because it is prime and its reverse (18783883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38838781 - 2¹⁵ = 38806013 is a prime.

It is a super-2 number, since 2×38838781² = 3016901819131922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38838181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19419390 + 19419391.

It is an arithmetic number, because the mean of its divisors is an integer number (19419391).

Almost surely, 2^38838781 is an apocalyptic number.

It is an amenable number.

38838781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38838781 is an equidigital number, since it uses as much as digits as its factorization.

38838781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 46.

The square root of 38838781 is about 6232.0767806567. The cubic root of 38838781 is about 338.6532102752.

The spelling of 38838781 in words is "thirty-eight million, eight hundred thirty-eight thousand, seven hundred eighty-one".