38506981 has 2 divisors, whose sum is σ = 38506982. Its totient is φ = 38506980.

The previous prime is 38506969. The next prime is 38506987. The reversal of 38506981 is 18960583.

It is a happy number.

38506981 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., 20520900 + 17986081 = 4530^2 + 4241^2 .

It is an emirp because it is prime and its reverse (18960583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38506981 - 2⁹ = 38506469 is a prime.

It is a super-2 number, since 2×38506981² = 2965575171468722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38506987) 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, 19253490 + 19253491.

It is an arithmetic number, because the mean of its divisors is an integer number (19253491).

Almost surely, 2^38506981 is an apocalyptic number.

It is an amenable number.

38506981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38506981 is an equidigital number, since it uses as much as digits as its factorization.

38506981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 38506981 is about 6205.3993425081. The cubic root of 38506981 is about 337.6860786406.

The spelling of 38506981 in words is "thirty-eight million, five hundred six thousand, nine hundred eighty-one".