38865681 has 6 divisors (see below), whose sum is σ = 56139330. Its totient is φ = 25910448.

The previous prime is 38865649. The next prime is 38865703. The reversal of 38865681 is 18656883.

38865681 is a `hidden beast` number, since 3 + 8 + 86 + 568 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29811600 + 9054081 = 5460^2 + 3009^2 .

It is not a de Polignac number, because 38865681 - 2⁵ = 38865649 is a prime.

It is a super-2 number, since 2×38865681² = 3021082319187522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38865611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2159196 + ... + 2159213.

It is an arithmetic number, because the mean of its divisors is an integer number (9356555).

Almost surely, 2^38865681 is an apocalyptic number.

It is an amenable number.

38865681 is a deficient number, since it is larger than the sum of its proper divisors (17273649).

38865681 is a wasteful number, since it uses less digits than its factorization.

38865681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318415 (or 4318412 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 38865681 is about 6234.2345961633. The cubic root of 38865681 is about 338.7313767261.

The spelling of 38865681 in words is "thirty-eight million, eight hundred sixty-five thousand, six hundred eighty-one".