999916 has 12 divisors (see below), whose sum is σ = 1756888. Its totient is φ = 497952.

The previous prime is 999907. The next prime is 999917. The reversal of 999916 is 619999.

It is not an unprimeable number, because it can be changed into a prime (999917) by changing a digit.

999916 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1555 + ... + 2101.

2⁹⁹⁹⁹¹⁶ is an apocalyptic number.

999916 is the 535-th centered heptagonal number.

It is an amenable number.

999916 is a deficient number, since it is larger than the sum of its proper divisors (756972).

999916 is a wasteful number, since it uses less digits than its factorization.

999916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008 (or 1006 counting only the distinct ones).

The product of its digits is 39366, while the sum is 43.

The square root of 999916 is about 999.9579991180. The cubic root of 999916 is about 99.9971999216.

The spelling of 999916 in words is "nine hundred ninety-nine thousand, nine hundred sixteen".