38918791 has 2 divisors, whose sum is σ = 38918792. Its totient is φ = 38918790.

The previous prime is 38918771. The next prime is 38918807. The reversal of 38918791 is 19781983.

38918791 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 38918791 - 2¹⁷ = 38787719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38918771) 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, 19459395 + 19459396.

It is an arithmetic number, because the mean of its divisors is an integer number (19459396).

Almost surely, 2^38918791 is an apocalyptic number.

38918791 is a deficient number, since it is larger than the sum of its proper divisors (1).

38918791 is an equidigital number, since it uses as much as digits as its factorization.

38918791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 38918791 is about 6238.4926865390. The cubic root of 38918791 is about 338.8855987776.

The spelling of 38918791 in words is "thirty-eight million, nine hundred eighteen thousand, seven hundred ninety-one".