38630981 has 2 divisors, whose sum is σ = 38630982. Its totient is φ = 38630980.

The previous prime is 38630957. The next prime is 38631031. The reversal of 38630981 is 18903683.

38630981 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., 38328481 + 302500 = 6191^2 + 550^2 .

It is an emirp because it is prime and its reverse (18903683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38630981 - 2¹⁰ = 38629957 is a prime.

It is a super-2 number, since 2×38630981² = 2984705386044722, 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 (38630951) 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, 19315490 + 19315491.

It is an arithmetic number, because the mean of its divisors is an integer number (19315491).

Almost surely, 2^38630981 is an apocalyptic number.

It is an amenable number.

38630981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38630981 is an equidigital number, since it uses as much as digits as its factorization.

38630981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 38630981 is about 6215.3826109098. The cubic root of 38630981 is about 338.0481619686.

The spelling of 38630981 in words is "thirty-eight million, six hundred thirty thousand, nine hundred eighty-one".