899979999 has 4 divisors (see below), whose sum is σ = 1199973336. Its totient is φ = 599986664.

The previous prime is 899979953. The next prime is 899980001. The reversal of 899979999 is 999979998.

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 899979999 - 2¹¹ = 899977951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899979919) 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, 149996664 + ... + 149996669.

It is an arithmetic number, because the mean of its divisors is an integer number (299993334).

Almost surely, 2^899979999 is an apocalyptic number.

899979999 is a deficient number, since it is larger than the sum of its proper divisors (299993337).

899979999 is a wasteful number, since it uses less digits than its factorization.

899979999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299993336.

The product of its digits is 267846264, while the sum is 78.

The square root of 899979999 is about 29999.6666481479. Note that the first 4 decimals coincide. The cubic root of 899979999 is about 965.4822324218.

Subtracting 899979999 from its reverse (999979998), we obtain a palindrome (99999999).

The spelling of 899979999 in words is "eight hundred ninety-nine million, nine hundred seventy-nine thousand, nine hundred ninety-nine".