999776223 has 16 divisors (see below), whose sum is σ = 1521182560. Its totient is φ = 648502848.

The previous prime is 999776191. The next prime is 999776233. The reversal of 999776223 is 322677999.

999776223 is a `hidden beast` number, since 9 + 9 + 9 + 7 + 7 + 622 + 3 = 666.

It is not a de Polignac number, because 999776223 - 2⁵ = 999776191 is a prime.

It is a super-2 number, since 2×999776223² = 1999104992152291458, which contains 22 as substring.

It is a Duffinian number.

999776223 is a modest number, since divided by 776223 gives 999 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 999776223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999776233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499390 + ... + 501387.

It is an arithmetic number, because the mean of its divisors is an integer number (95073910).

Almost surely, 2^999776223 is an apocalyptic number.

999776223 is a deficient number, since it is larger than the sum of its proper divisors (521406337).

999776223 is a wasteful number, since it uses less digits than its factorization.

999776223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000823 (or 1000817 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 54.

The square root of 999776223 is about 31619.2381786785. The cubic root of 999776223 is about 999.9254021020.

It can be divided in two parts, 999776 and 223, that added together give a palindrome (999999).

The spelling of 999776223 in words is "nine hundred ninety-nine million, seven hundred seventy-six thousand, two hundred twenty-three".