999909223 has 4 divisors (see below), whose sum is σ = 1000278088. Its totient is φ = 999540360.

The previous prime is 999909151. The next prime is 999909233. The reversal of 999909223 is 322909999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322909999 = 409 ⋅789511.

It is a cyclic number.

It is not a de Polignac number, because 999909223 - 2¹⁷ = 999778151 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 (999909233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180336 + ... + 185797.

It is an arithmetic number, because the mean of its divisors is an integer number (250069522).

Almost surely, 2^999909223 is an apocalyptic number.

999909223 is a deficient number, since it is larger than the sum of its proper divisors (368865).

999909223 is a wasteful number, since it uses less digits than its factorization.

999909223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368864.

The product of its (nonzero) digits is 708588, while the sum is 52.

The square root of 999909223 is about 31621.3412587132. The cubic root of 999909223 is about 999.9697400843.

The spelling of 999909223 in words is "nine hundred ninety-nine million, nine hundred nine thousand, two hundred twenty-three".