999855008 has 12 divisors (see below), whose sum is σ = 1968464610. Its totient is φ = 499927488.

The previous prime is 999855007. The next prime is 999855019. The reversal of 999855008 is 800558999.

It can be written as a sum of positive squares in only one way, i.e., 839376784 + 160478224 = 28972^2 + 12668^2 .

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622703 + ... + 15622766.

Almost surely, 2^999855008 is an apocalyptic number.

It is an amenable number.

999855008 is a deficient number, since it is larger than the sum of its proper divisors (968609602).

999855008 is a wasteful number, since it uses less digits than its factorization.

999855008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31245479 (or 31245471 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 53.

The square root of 999855008 is about 31620.4839937658. The cubic root of 999855008 is about 999.9516669973.

The spelling of 999855008 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, eight".