38817681 has 32 divisors (see below), whose sum is σ = 63037440. Its totient is φ = 20741376.

The previous prime is 38817679. The next prime is 38817683. The reversal of 38817681 is 18671883.

It is an interprime number because it is at equal distance from previous prime (38817679) and next prime (38817683).

It is not a de Polignac number, because 38817681 - 2¹ = 38817679 is a prime.

It is a super-2 number, since 2×38817681² = 3013624716435522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (38817683) 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 in 31 ways as a sum of consecutive naturals, for example, 80800 + ... + 81278.

It is an arithmetic number, because the mean of its divisors is an integer number (1969920).

Almost surely, 2^38817681 is an apocalyptic number.

It is an amenable number.

38817681 is a deficient number, since it is larger than the sum of its proper divisors (24219759).

38817681 is a wasteful number, since it uses less digits than its factorization.

38817681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733.

The product of its digits is 64512, while the sum is 42.

The square root of 38817681 is about 6230.3836960495. The cubic root of 38817681 is about 338.5918722952.

The spelling of 38817681 in words is "thirty-eight million, eight hundred seventeen thousand, six hundred eighty-one".