8423847989 has 2 divisors, whose sum is σ = 8423847990. Its totient is φ = 8423847988.

The previous prime is 8423847983. The next prime is 8423848061. The reversal of 8423847989 is 9897483248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7782239089 + 641608900 = 88217^2 + 25330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8423847989 is a prime.

It is a super-2 number, since 2×8423847989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8423847983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4211923994 + 4211923995.

It is an arithmetic number, because the mean of its divisors is an integer number (4211923995).

Almost surely, 2^8423847989 is an apocalyptic number.

It is an amenable number.

8423847989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8423847989 is an equidigital number, since it uses as much as digits as its factorization.

8423847989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 62.

The square root of 8423847989 is about 91781.5231351060. The cubic root of 8423847989 is about 2034.7146268592.

The spelling of 8423847989 in words is "eight billion, four hundred twenty-three million, eight hundred forty-seven thousand, nine hundred eighty-nine".