8999999 has 4 divisors (see below), whose sum is σ = 9006000. Its totient is φ = 8994000.

The previous prime is 8999993. The next prime is 9000011. The reversal of 8999999 is 9999998.

8999999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 3000²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9999998 = 2 ⋅4999999.

It is a cyclic number.

It is not a de Polignac number, because 8999999 - 2¹⁶ = 8934463 is a prime.

It is a Duffinian number.

8999999 is a modest number, since divided by 9999 gives 899 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8999993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499 + ... + 4499.

It is an arithmetic number, because the mean of its divisors is an integer number (2251500).

Almost surely, 2^8999999 is an apocalyptic number.

8999999 is a deficient number, since it is larger than the sum of its proper divisors (6001).

8999999 is a wasteful number, since it uses less digits than its factorization.

8999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000.

The product of its digits is 4251528, while the sum is 62.

The square root of 8999999 is about 2999.9998333333. Note that the first 3 decimals coincide. The cubic root of 8999999 is about 208.0083746012.

Subtracting 8999999 from its reverse (9999998), we obtain a palindrome (999999).

The spelling of 8999999 in words is "eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".