38987777 has 2 divisors, whose sum is σ = 38987778. Its totient is φ = 38987776.

The previous prime is 38987743. The next prime is 38987789. The reversal of 38987777 is 77778983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23902321 + 15085456 = 4889^2 + 3884^2 .

It is an emirp because it is prime and its reverse (77778983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38987777 - 2⁸ = 38987521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38987797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19493888 + 19493889.

It is an arithmetic number, because the mean of its divisors is an integer number (19493889).

Almost surely, 2^38987777 is an apocalyptic number.

It is an amenable number.

38987777 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987777 is an equidigital number, since it uses as much as digits as its factorization.

38987777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4148928, while the sum is 56.

The square root of 38987777 is about 6244.0192984968. The cubic root of 38987777 is about 339.0857125847.

The spelling of 38987777 in words is "thirty-eight million, nine hundred eighty-seven thousand, seven hundred seventy-seven".