38657681 has 2 divisors, whose sum is σ = 38657682. Its totient is φ = 38657680.

The previous prime is 38657659. The next prime is 38657693. The reversal of 38657681 is 18675683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31259281 + 7398400 = 5591^2 + 2720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38657681 is a prime.

It is a super-3 number, since 3×38657681³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (38657981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19328840 + 19328841.

It is an arithmetic number, because the mean of its divisors is an integer number (19328841).

Almost surely, 2^38657681 is an apocalyptic number.

It is an amenable number.

38657681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38657681 is an equidigital number, since it uses as much as digits as its factorization.

38657681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 38657681 is about 6217.5301366379. The cubic root of 38657681 is about 338.1260252713.

The spelling of 38657681 in words is "thirty-eight million, six hundred fifty-seven thousand, six hundred eighty-one".