38669681 has 2 divisors, whose sum is σ = 38669682. Its totient is φ = 38669680.

The previous prime is 38669671. The next prime is 38669707. The reversal of 38669681 is 18696683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26173456 + 12496225 = 5116^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 38669681 - 2²² = 34475377 is a prime.

It is a super-2 number, since 2×38669681² = 2990688457283522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38669621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19334840 + 19334841.

It is an arithmetic number, because the mean of its divisors is an integer number (19334841).

Almost surely, 2^38669681 is an apocalyptic number.

It is an amenable number.

38669681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38669681 is an equidigital number, since it uses as much as digits as its factorization.

38669681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 38669681 is about 6218.4950751770. The cubic root of 38669681 is about 338.1610083366.

The spelling of 38669681 in words is "thirty-eight million, six hundred sixty-nine thousand, six hundred eighty-one".