999868999 has 4 divisors (see below), whose sum is σ = 1006490800. Its totient is φ = 993247200.

The previous prime is 999868997. The next prime is 999869027.

999868999 is nontrivially palindromic in base 10.

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 999868999 - 2¹ = 999868997 is a prime.

It is a super-2 number, since 2×999868999² = 1999476030322524002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999868997) 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, 3310674 + ... + 3310975.

It is an arithmetic number, because the mean of its divisors is an integer number (251622700).

Almost surely, 2^999868999 is an apocalyptic number.

999868999 is a deficient number, since it is larger than the sum of its proper divisors (6621801).

999868999 is a wasteful number, since it uses less digits than its factorization.

999868999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6621800.

The product of its digits is 204073344, while the sum is 76.

The square root of 999868999 is about 31620.7052261647. The cubic root of 999868999 is about 999.9563310931.

The spelling of 999868999 in words is "nine hundred ninety-nine million, eight hundred sixty-eight thousand, nine hundred ninety-nine".