38912981 has 2 divisors, whose sum is σ = 38912982. Its totient is φ = 38912980.

The previous prime is 38912963. The next prime is 38913001. The reversal of 38912981 is 18921983.

38912981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 10504081 = 5330^2 + 3241^2 .

It is a cyclic number.

It is not a de Polignac number, because 38912981 - 2¹⁴ = 38896597 is a prime.

It is a super-2 number, since 2×38912981² = 3028440180612722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38912581) 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, 19456490 + 19456491.

It is an arithmetic number, because the mean of its divisors is an integer number (19456491).

Almost surely, 2^38912981 is an apocalyptic number.

It is an amenable number.

38912981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38912981 is an equidigital number, since it uses as much as digits as its factorization.

38912981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 38912981 is about 6238.0270118043. The cubic root of 38912981 is about 338.8687344021.

It can be divided in two parts, 38912 and 981, that added together give a palindrome (39893).

The spelling of 38912981 in words is "thirty-eight million, nine hundred twelve thousand, nine hundred eighty-one".