899888999 has 4 divisors (see below), whose sum is σ = 952823664. Its totient is φ = 846954336.

The previous prime is 899888981. The next prime is 899889013. The reversal of 899888999 is 999888998.

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 899888999 - 2¹² = 899884903 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 (899888929) 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, 26467307 + ... + 26467340.

It is an arithmetic number, because the mean of its divisors is an integer number (238205916).

Almost surely, 2^899888999 is an apocalyptic number.

899888999 is a deficient number, since it is larger than the sum of its proper divisors (52934665).

899888999 is a wasteful number, since it uses less digits than its factorization.

899888999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52934664.

The product of its digits is 241864704, while the sum is 77.

The square root of 899888999 is about 29998.1499262871. The cubic root of 899888999 is about 965.4496902747.

Subtracting 899888999 from its reverse (999888998), we obtain a palindrome (99999999).

The spelling of 899888999 in words is "eight hundred ninety-nine million, eight hundred eighty-eight thousand, nine hundred ninety-nine".