38987321 has 2 divisors, whose sum is σ = 38987322. Its totient is φ = 38987320.

The previous prime is 38987317. The next prime is 38987327. The reversal of 38987321 is 12378983.

38987321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26988025 + 11999296 = 5195^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 38987321 - 2² = 38987317 is a prime.

It is a super-2 number, since 2×38987321² = 3040022397514082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38987327) 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, 19493660 + 19493661.

It is an arithmetic number, because the mean of its divisors is an integer number (19493661).

Almost surely, 2^38987321 is an apocalyptic number.

It is an amenable number.

38987321 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987321 is an equidigital number, since it uses as much as digits as its factorization.

38987321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 38987321 is about 6243.9827834484. The cubic root of 38987321 is about 339.0843906004.

The spelling of 38987321 in words is "thirty-eight million, nine hundred eighty-seven thousand, three hundred twenty-one".