8999423985 has 32 divisors (see below), whose sum is σ = 15075123840. Its totient is φ = 4578334208.

The previous prime is 8999423971. The next prime is 8999423989. The reversal of 8999423985 is 5893249998.

It is a cyclic number.

It is not a de Polignac number, because 8999423985 - 2²³ = 8991035377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8999423989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88524 + ... + 160733.

It is an arithmetic number, because the mean of its divisors is an integer number (471097620).

Almost surely, 2^8999423985 is an apocalyptic number.

It is an amenable number.

8999423985 is a deficient number, since it is larger than the sum of its proper divisors (6075699855).

8999423985 is a wasteful number, since it uses less digits than its factorization.

8999423985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249377.

The product of its digits is 50388480, while the sum is 66.

The square root of 8999423985 is about 94865.2938908640. The cubic root of 8999423985 is about 2080.0394458280.

The spelling of 8999423985 in words is "eight billion, nine hundred ninety-nine million, four hundred twenty-three thousand, nine hundred eighty-five".