999565998 has 8 divisors (see below), whose sum is σ = 1999132008. Its totient is φ = 333188664.

The previous prime is 999565991. The next prime is 999565999. The reversal of 999565998 is 899565999.

It is a sphenic number, since it is the product of 3 distinct primes.

999565998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999565991) 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, 83297161 + ... + 83297172.

It is an arithmetic number, because the mean of its divisors is an integer number (249891501).

Almost surely, 2^999565998 is an apocalyptic number.

999565998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999565998 is a wasteful number, since it uses less digits than its factorization.

999565998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166594338.

The product of its digits is 70858800, while the sum is 69.

The square root of 999565998 is about 31615.9136828275. The cubic root of 999565998 is about 999.8553117330.

Subtracting from 999565998 its reverse (899565999), we obtain a palindrome (99999999).

The spelling of 999565998 in words is "nine hundred ninety-nine million, five hundred sixty-five thousand, nine hundred ninety-eight".