7889747897 has 2 divisors, whose sum is σ = 7889747898. Its totient is φ = 7889747896.

The previous prime is 7889747893. The next prime is 7889747909. The reversal of 7889747897 is 7987479887.

It is a happy number.

7889747897 is digitally balanced in base 3, 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., 7768835881 + 120912016 = 88141^2 + 10996^2 .

It is an emirp because it is prime and its reverse (7987479887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7889747897 - 2² = 7889747893 is a prime.

It is not a weakly prime, because it can be changed into another prime (7889747893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3944873948 + 3944873949.

It is an arithmetic number, because the mean of its divisors is an integer number (3944873949).

Almost surely, 2^7889747897 is an apocalyptic number.

It is an amenable number.

7889747897 is a deficient number, since it is larger than the sum of its proper divisors (1).

7889747897 is an equidigital number, since it uses as much as digits as its factorization.

7889747897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 398297088, while the sum is 74.

The square root of 7889747897 is about 88824.2528648567. The cubic root of 7889747897 is about 1990.7697919113.

The spelling of 7889747897 in words is "seven billion, eight hundred eighty-nine million, seven hundred forty-seven thousand, eight hundred ninety-seven".