38587981 has 2 divisors, whose sum is σ = 38587982. Its totient is φ = 38587980.

The previous prime is 38587979. The next prime is 38588041. The reversal of 38587981 is 18978583.

38587981 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., 35581225 + 3006756 = 5965^2 + 1734^2 .

It is a cyclic number.

It is not a de Polignac number, because 38587981 - 2¹ = 38587979 is a prime.

It is a super-2 number, since 2×38587981² = 2978064555312722, which contains 22 as substring.

Together with 38587979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38587181) 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, 19293990 + 19293991.

It is an arithmetic number, because the mean of its divisors is an integer number (19293991).

Almost surely, 2^38587981 is an apocalyptic number.

It is an amenable number.

38587981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38587981 is an equidigital number, since it uses as much as digits as its factorization.

38587981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 49.

The square root of 38587981 is about 6211.9224882479. The cubic root of 38587981 is about 337.9226886890.

The spelling of 38587981 in words is "thirty-eight million, five hundred eighty-seven thousand, nine hundred eighty-one".