38641681 has 12 divisors (see below), whose sum is σ = 42023388. Its totient is φ = 35515584.

The previous prime is 38641667. The next prime is 38641693. The reversal of 38641681 is 18614683.

It can be written as a sum of positive squares in 6 ways, for example, as 17297281 + 21344400 = 4159^2 + 4620^2 .

It is not a de Polignac number, because 38641681 - 2⁷ = 38641553 is a prime.

It is a super-2 number, since 2×38641681² = 2986359021011522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38641681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38641651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62731 + ... + 63343.

It is an arithmetic number, because the mean of its divisors is an integer number (3501949).

Almost surely, 2^38641681 is an apocalyptic number.

It is an amenable number.

38641681 is a deficient number, since it is larger than the sum of its proper divisors (3381707).

38641681 is a wasteful number, since it uses less digits than its factorization.

38641681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 999 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 38641681 is about 6216.2433189186. The cubic root of 38641681 is about 338.0793699209.

The spelling of 38641681 in words is "thirty-eight million, six hundred forty-one thousand, six hundred eighty-one".