38946581 has 2 divisors, whose sum is σ = 38946582. Its totient is φ = 38946580.

The previous prime is 38946577. The next prime is 38946601. The reversal of 38946581 is 18564983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 320356 = 6215^2 + 566^2 .

It is an emirp because it is prime and its reverse (18564983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38946581 - 2² = 38946577 is a prime.

It is a super-2 number, since 2×38946581² = 3033672343179122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (38946511) 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, 19473290 + 19473291.

It is an arithmetic number, because the mean of its divisors is an integer number (19473291).

Almost surely, 2^38946581 is an apocalyptic number.

It is an amenable number.

38946581 is a deficient number, since it is larger than the sum of its proper divisors (1).

38946581 is an equidigital number, since it uses as much as digits as its factorization.

38946581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The square root of 38946581 is about 6240.7195899191. The cubic root of 38946581 is about 338.9662401155.

The spelling of 38946581 in words is "thirty-eight million, nine hundred forty-six thousand, five hundred eighty-one".