38718521 has 2 divisors, whose sum is σ = 38718522. Its totient is φ = 38718520.

The previous prime is 38718487. The next prime is 38718541. The reversal of 38718521 is 12581783.

38718521 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., 19891600 + 18826921 = 4460^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 38718521 - 2⁶ = 38718457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38718541) 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, 19359260 + 19359261.

It is an arithmetic number, because the mean of its divisors is an integer number (19359261).

Almost surely, 2^38718521 is an apocalyptic number.

It is an amenable number.

38718521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38718521 is an equidigital number, since it uses as much as digits as its factorization.

38718521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 38718521 is about 6222.4208311557. The cubic root of 38718521 is about 338.3033147889.

The spelling of 38718521 in words is "thirty-eight million, seven hundred eighteen thousand, five hundred twenty-one".