8909999 has 4 divisors (see below), whose sum is σ = 10182864. Its totient is φ = 7637136.

The previous prime is 8909983. The next prime is 8910001. The reversal of 8909999 is 9999098.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8909999 - 2⁴ = 8909983 is a prime.

It is a Duffinian number.

8909999 is a modest number, since divided by 9999 gives 890 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 8909999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8909909) 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, 636422 + ... + 636435.

It is an arithmetic number, because the mean of its divisors is an integer number (2545716).

Almost surely, 2^8909999 is an apocalyptic number.

8909999 is a deficient number, since it is larger than the sum of its proper divisors (1272865).

8909999 is a wasteful number, since it uses less digits than its factorization.

8909999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272864.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 8909999 is about 2984.9621438136. The cubic root of 8909999 is about 207.3126891445.

It can be divided in two parts, 89099 and 99, that added together give a palindrome (89198).

The spelling of 8909999 in words is "eight million, nine hundred nine thousand, nine hundred ninety-nine".