38720428988729 has 2 divisors, whose sum is σ = 38720428988730. Its totient is φ = 38720428988728.

The previous prime is 38720428988699. The next prime is 38720428988737. The reversal of 38720428988729 is 92788982402783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35339695878400 + 3380733110329 = 5944720^2 + 1838677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38720428988729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38720428988729.

It is not a weakly prime, because it can be changed into another prime (38720428988929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360214494364 + 19360214494365.

It is an arithmetic number, because the mean of its divisors is an integer number (19360214494365).

Almost surely, 2^{38720428988729} is an apocalyptic number.

It is an amenable number.

38720428988729 is a deficient number, since it is larger than the sum of its proper divisors (1).

38720428988729 is an equidigital number, since it uses as much as digits as its factorization.

38720428988729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1560674304, while the sum is 77.

The spelling of 38720428988729 in words is "thirty-eight trillion, seven hundred twenty billion, four hundred twenty-eight million, nine hundred eighty-eight thousand, seven hundred twenty-nine".