38957881 has 4 divisors (see below), whose sum is σ = 39395700. Its totient is φ = 38520064.

The previous prime is 38957869. The next prime is 38957909. The reversal of 38957881 is 18875983.

38957881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18875983 = 7 ⋅2696569.

It can be written as a sum of positive squares in 2 ways, for example, as 4910656 + 34047225 = 2216^2 + 5835^2 .

It is a cyclic number.

It is not a de Polignac number, because 38957881 - 2¹³ = 38949689 is a prime.

It is a super-2 number, since 2×38957881² = 3035432984020322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38957801) 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 in 3 ways as a sum of consecutive naturals, for example, 218776 + ... + 218953.

It is an arithmetic number, because the mean of its divisors is an integer number (9848925).

Almost surely, 2^38957881 is an apocalyptic number.

It is an amenable number.

38957881 is a deficient number, since it is larger than the sum of its proper divisors (437819).

38957881 is an equidigital number, since it uses as much as digits as its factorization.

38957881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437818.

The product of its digits is 483840, while the sum is 49.

The square root of 38957881 is about 6241.6248685739. The cubic root of 38957881 is about 338.9990196135. Note that the first 3 decimals are identical.

The spelling of 38957881 in words is "thirty-eight million, nine hundred fifty-seven thousand, eight hundred eighty-one".