38987789 has 2 divisors, whose sum is σ = 38987790. Its totient is φ = 38987788.

The previous prime is 38987777. The next prime is 38987797. The reversal of 38987789 is 98778983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31832164 + 7155625 = 5642^2 + 2675^2 .

It is an emirp because it is prime and its reverse (98778983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38987789 - 2¹⁶ = 38922253 is a prime.

It is a super-2 number, since 2×38987789² = 3040095382217042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38987189) 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, 19493894 + 19493895.

It is an arithmetic number, because the mean of its divisors is an integer number (19493895).

Almost surely, 2^38987789 is an apocalyptic number.

It is an amenable number.

38987789 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987789 is an equidigital number, since it uses as much as digits as its factorization.

38987789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 59.

The square root of 38987789 is about 6244.0202594162. The cubic root of 38987789 is about 339.0857473736.

The spelling of 38987789 in words is "thirty-eight million, nine hundred eighty-seven thousand, seven hundred eighty-nine".