38666981 has 2 divisors, whose sum is σ = 38666982. Its totient is φ = 38666980.

The previous prime is 38666939. The next prime is 38667001. The reversal of 38666981 is 18966683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 7474756 = 5585^2 + 2734^2 .

It is a cyclic number.

It is not a de Polignac number, because 38666981 - 2¹⁴ = 38650597 is a prime.

It is a super-2 number, since 2×38666981² = 2990270839308722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38666081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19333490 + 19333491.

It is an arithmetic number, because the mean of its divisors is an integer number (19333491).

Almost surely, 2^38666981 is an apocalyptic number.

It is an amenable number.

38666981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38666981 is an equidigital number, since it uses as much as digits as its factorization.

38666981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 38666981 is about 6218.2779770609. The cubic root of 38666981 is about 338.1531377780.

The spelling of 38666981 in words is "thirty-eight million, six hundred sixty-six thousand, nine hundred eighty-one".