38857139 has 2 divisors, whose sum is σ = 38857140. Its totient is φ = 38857138.

The previous prime is 38857123. The next prime is 38857151. The reversal of 38857139 is 93175883.

It is a happy number.

38857139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38857139 - 2⁴ = 38857123 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38857139.

It is not a weakly prime, because it can be changed into another prime (38857199) 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, 19428569 + 19428570.

It is an arithmetic number, because the mean of its divisors is an integer number (19428570).

Almost surely, 2^38857139 is an apocalyptic number.

38857139 is a deficient number, since it is larger than the sum of its proper divisors (1).

38857139 is an equidigital number, since it uses as much as digits as its factorization.

38857139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 38857139 is about 6233.5494704061. The cubic root of 38857139 is about 338.7065591549.

The spelling of 38857139 in words is "thirty-eight million, eight hundred fifty-seven thousand, one hundred thirty-nine".