38781857 has 2 divisors, whose sum is σ = 38781858. Its totient is φ = 38781856.

The previous prime is 38781851. The next prime is 38781877. The reversal of 38781857 is 75818783.

38781857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38738176 + 43681 = 6224^2 + 209^2 .

It is an emirp because it is prime and its reverse (75818783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38781857 - 2⁸ = 38781601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38781851) 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 as a sum of consecutive naturals, namely, 19390928 + 19390929.

It is an arithmetic number, because the mean of its divisors is an integer number (19390929).

Almost surely, 2^38781857 is an apocalyptic number.

It is an amenable number.

38781857 is a deficient number, since it is larger than the sum of its proper divisors (1).

38781857 is an equidigital number, since it uses as much as digits as its factorization.

38781857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 47.

The square root of 38781857 is about 6227.5080891156. The cubic root of 38781857 is about 338.4876805261.

The spelling of 38781857 in words is "thirty-eight million, seven hundred eighty-one thousand, eight hundred fifty-seven".