999906 has 16 divisors (see below), whose sum is σ = 2117664. Its totient is φ = 313664.

The previous prime is 999883. The next prime is 999907. The reversal of 999906 is 609999.

999906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (999907) by changing a digit.

999906 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4800 + ... + 5003.

It is an arithmetic number, because the mean of its divisors is an integer number (132354).

2⁹⁹⁹⁹⁰⁶ is an apocalyptic number.

999906 is an abundant number, since it is smaller than the sum of its proper divisors (1117758).

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

999906 is a wasteful number, since it uses less digits than its factorization.

999906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9825.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 999906 is about 999.9529988954. The cubic root of 999906 is about 99.9968665685.

The spelling of 999906 in words is "nine hundred ninety-nine thousand, nine hundred six".