8993999 has 18 divisors (see below), whose sum is σ = 10867392. Its totient is φ = 7421400.

The previous prime is 8993981. The next prime is 8994017. The reversal of 8993999 is 9993998.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8993981) and next prime (8994017).

It is not a de Polignac number, because 8993999 - 2²⁰ = 7945423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8993909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46994 + ... + 47184.

It is an arithmetic number, because the mean of its divisors is an integer number (603744).

Almost surely, 2^8993999 is an apocalyptic number.

8993999 is a deficient number, since it is larger than the sum of its proper divisors (1873393).

8993999 is a wasteful number, since it uses less digits than its factorization.

8993999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 229 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 56.

The square root of 8993999 is about 2998.9996665555. Note that the first 3 decimals coincide. The cubic root of 8993999 is about 207.9621402370.

Subtracting 8993999 from its reverse (9993998), we obtain a palindrome (999999).

The spelling of 8993999 in words is "eight million, nine hundred ninety-three thousand, nine hundred ninety-nine".