999855006 has 16 divisors (see below), whose sum is σ = 2046215424. Its totient is φ = 325534104.

The previous prime is 999855001. The next prime is 999855007. The reversal of 999855006 is 600558999.

It is a self number, because there is not a number n which added to its sum of digits gives 999855006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999855001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937446 + ... + 1937961.

It is an arithmetic number, because the mean of its divisors is an integer number (127888464).

Almost surely, 2^999855006 is an apocalyptic number.

999855006 is an abundant number, since it is smaller than the sum of its proper divisors (1046360418).

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

999855006 is a wasteful number, since it uses less digits than its factorization.

999855006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875455.

The product of its (nonzero) digits is 874800, while the sum is 51.

The square root of 999855006 is about 31620.4839621407. The cubic root of 999855006 is about 999.9516663306.

The spelling of 999855006 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, six".