999223808 has 90 divisors (see below), whose sum is σ = 2211911163. Its totient is φ = 450616320.

The previous prime is 999223801. The next prime is 999223811. The reversal of 999223808 is 808322999.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 499611904 + 499611904 = 22352^2 + 22352^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=22352.

It is not an unprimeable number, because it can be changed into a prime (999223801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7867841 + ... + 7867967.

Almost surely, 2^999223808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999223808

999223808 is an abundant number, since it is smaller than the sum of its proper divisors (1212687355).

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

999223808 is an equidigital number, since it uses as much as digits as its factorization.

999223808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 999223808 is about 31610.5015461634. The cubic root of 999223808 is about 999.7412023629.

Multiplying 999223808 by its sum of digits (50), we get a square (49961190400 = 223520²).

The spelling of 999223808 in words is "nine hundred ninety-nine million, two hundred twenty-three thousand, eight hundred eight".