38987521 has 2 divisors, whose sum is σ = 38987522. Its totient is φ = 38987520.

The previous prime is 38987519. The next prime is 38987549. The reversal of 38987521 is 12578983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34386496 + 4601025 = 5864^2 + 2145^2 .

It is an emirp because it is prime and its reverse (12578983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38987521 - 2¹ = 38987519 is a prime.

Together with 38987519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (38987551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19493760 + 19493761.

It is an arithmetic number, because the mean of its divisors is an integer number (19493761).

Almost surely, 2^38987521 is an apocalyptic number.

It is an amenable number.

38987521 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987521 is an equidigital number, since it uses as much as digits as its factorization.

38987521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 38987521 is about 6243.9987988468. The cubic root of 38987521 is about 339.0849704193.

The spelling of 38987521 in words is "thirty-eight million, nine hundred eighty-seven thousand, five hundred twenty-one".