38659681 has 2 divisors, whose sum is σ = 38659682. Its totient is φ = 38659680.

The previous prime is 38659667. The next prime is 38659703. The reversal of 38659681 is 18695683.

38659681 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., 38638656 + 21025 = 6216^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 38659681 - 2⁹ = 38659169 is a prime.

It is a super-3 number, since 3×38659681³ (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 (38659601) 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, 19329840 + 19329841.

It is an arithmetic number, because the mean of its divisors is an integer number (19329841).

Almost surely, 2^38659681 is an apocalyptic number.

It is an amenable number.

38659681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38659681 is an equidigital number, since it uses as much as digits as its factorization.

38659681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 38659681 is about 6217.6909701271. The cubic root of 38659681 is about 338.1318562849.

It can be divided in two parts, 38659 and 681, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 38659681 in words is "thirty-eight million, six hundred fifty-nine thousand, six hundred eighty-one".