38181557 has 2 divisors, whose sum is σ = 38181558. Its totient is φ = 38181556.

The previous prime is 38181527. The next prime is 38181581. The reversal of 38181557 is 75518183.

38181557 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 can be written as a sum of positive squares in only one way, i.e., 26306641 + 11874916 = 5129^2 + 3446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38181557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38181557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38181527) 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, 19090778 + 19090779.

It is an arithmetic number, because the mean of its divisors is an integer number (19090779).

Almost surely, 2^38181557 is an apocalyptic number.

It is an amenable number.

38181557 is a deficient number, since it is larger than the sum of its proper divisors (1).

38181557 is an equidigital number, since it uses as much as digits as its factorization.

38181557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 38.

The square root of 38181557 is about 6179.1226723541. The cubic root of 38181557 is about 336.7321201803.

The spelling of 38181557 in words is "thirty-eight million, one hundred eighty-one thousand, five hundred fifty-seven".